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CVE-2026-33249 (GCVE-0-2026-33249)

Vulnerability from nvd – Published: 2026-03-25 20:21 – Updated: 2026-03-25 20:21

Title

NATS: Message tracing can be redirected to arbitrary subject

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-15.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: >= 2.11.0, < 2.11.15 Affected: >= 2.12.0-preview.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.11.0, \u003c 2.11.15"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.12.0-preview.1, \u003c 2.12.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T20:21:30.156Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j"
        },
        {
          "name": "https://advisories.nats.io/CVE/secnote-2026-15.txt",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://advisories.nats.io/CVE/secnote-2026-15.txt"
        }
      ],
      "source": {
        "advisory": "GHSA-8m2x-3m6q-6w8j",
        "discovery": "UNKNOWN"
      },
      "title": "NATS: Message tracing can be redirected to arbitrary subject"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33249",
    "datePublished": "2026-03-25T20:21:30.156Z",
    "dateReserved": "2026-03-18T02:42:27.509Z",
    "dateUpdated": "2026-03-25T20:21:30.156Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-33248 (GCVE-0-2026-33248)

Vulnerability from nvd – Published: 2026-03-25 20:18 – Updated: 2026-03-25 20:18

Title

NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using mTLS for client identity, with `verify_and_map` to derive a NATS identity from the client certificate's Subject DN, certain patterns of RDN would not be correctly enforced, allowing for authentication bypass. This does require a valid certificate from a CA already trusted for client certificates, and `DN` naming patterns which the NATS maintainers consider highly unlikely. So this is an unlikely attack. Nonetheless, administrators who have been very sophisticated in their `DN` construction patterns might conceivably be impacted. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, developers should review their CA issuing practices.

Severity ?

4.2 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CWE

CWE-287 - Improper Authentication
CWE-295 - Improper Certificate Validation

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-13.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.15"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.12.0-RC.1, \u003c 2.12.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using mTLS for client identity, with `verify_and_map` to derive a NATS identity from the client certificate\u0027s Subject DN, certain patterns of RDN would not be correctly enforced, allowing for authentication bypass. This does require a valid certificate from a CA already trusted for client certificates, and `DN` naming patterns which the NATS maintainers consider highly unlikely. So this is an unlikely attack. Nonetheless, administrators who have been very sophisticated in their `DN` construction patterns might conceivably be impacted. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, developers should review their CA issuing practices."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.2,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-287",
              "description": "CWE-287: Improper Authentication",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-295",
              "description": "CWE-295: Improper Certificate Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T20:18:28.923Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nats-io/nats-server/security/advisories/GHSA-3f24-pcvm-5jqc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-3f24-pcvm-5jqc"
        },
        {
          "name": "https://advisories.nats.io/CVE/secnote-2026-13.txt",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://advisories.nats.io/CVE/secnote-2026-13.txt"
        }
      ],
      "source": {
        "advisory": "GHSA-3f24-pcvm-5jqc",
        "discovery": "UNKNOWN"
      },
      "title": "NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33248",
    "datePublished": "2026-03-25T20:18:28.923Z",
    "dateReserved": "2026-03-18T02:42:27.509Z",
    "dateUpdated": "2026-03-25T20:18:28.923Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-33223 (GCVE-0-2026-33223)

Vulnerability from nvd – Published: 2026-03-25 20:20 – Updated: 2026-03-25 20:20

Title

NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, the NATS message header `Nats-Request-Info:` is supposed to be a guarantee of identity by the NATS server, but the stripping of this header from inbound messages was not fully effective. An attacker with valid credentials for any regular client interface could thus spoof their identity to services which rely upon this header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

Severity ?

6.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CWE

CWE-290 - Authentication Bypass by Spoofing

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-09.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.15"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.12.0-RC.1, \u003c 2.12.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, the NATS message header `Nats-Request-Info:` is supposed to be a guarantee of identity by the NATS server, but the stripping of this header from inbound messages was not fully effective. An attacker with valid credentials for any regular client interface could thus spoof their identity to services which rely upon this header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-290",
              "description": "CWE-290: Authentication Bypass by Spoofing",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T20:20:00.158Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nats-io/nats-server/security/advisories/GHSA-pwx7-fx9r-hr4h",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-pwx7-fx9r-hr4h"
        },
        {
          "name": "https://advisories.nats.io/CVE/secnote-2026-09.txt",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://advisories.nats.io/CVE/secnote-2026-09.txt"
        }
      ],
      "source": {
        "advisory": "GHSA-pwx7-fx9r-hr4h",
        "discovery": "UNKNOWN"
      },
      "title": "NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33223",
    "datePublished": "2026-03-25T20:20:00.158Z",
    "dateReserved": "2026-03-17T23:23:58.315Z",
    "dateUpdated": "2026-03-25T20:20:00.158Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-33222 (GCVE-0-2026-33222)

Vulnerability from nvd – Published: 2026-03-25 20:10 – Updated: 2026-03-25 20:10

Title

NATS JetStream has an authorization bypass through its Management API

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, users with JetStream admin API access to restore one stream could restore to other stream names, impacting data which should have been protected against them. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, if developers have configured users to have limited JetStream restore permissions, temporarily remove those permissions.

Severity ?

4.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

CWE

CWE-285 - Improper Authorization

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-12.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.15"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.12.0-RC.1, \u003c 2.12.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, users with JetStream admin API access to restore one stream could restore to other stream names, impacting data which should have been protected against them. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, if developers have configured users to have limited JetStream restore permissions, temporarily remove those permissions."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-285",
              "description": "CWE-285: Improper Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T20:10:51.107Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nats-io/nats-server/security/advisories/GHSA-9983-vrx2-fg9c",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-9983-vrx2-fg9c"
        },
        {
          "name": "https://advisories.nats.io/CVE/secnote-2026-12.txt",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://advisories.nats.io/CVE/secnote-2026-12.txt"
        }
      ],
      "source": {
        "advisory": "GHSA-9983-vrx2-fg9c",
        "discovery": "UNKNOWN"
      },
      "title": "NATS JetStream has an authorization bypass through its Management API"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33222",
    "datePublished": "2026-03-25T20:10:51.107Z",
    "dateReserved": "2026-03-17T23:23:58.315Z",
    "dateUpdated": "2026-03-25T20:10:51.107Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-33247 (GCVE-0-2026-33247)

Vulnerability from nvd – Published: 2026-03-25 20:02 – Updated: 2026-03-25 20:02

Title

NATS credentials are exposed in monitoring port via command-line argv

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, if a nats-server is run with static credentials for all clients provided via argv (the command-line), then those credentials are visible to any user who can see the monitoring port, if that too is enabled. The `/debug/vars` end-point contains an unredacted copy of argv. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, configure credentials inside a configuration file instead of via argv, and do not enable the monitoring port if using secrets in argv. Best practice remains to not expose the monitoring port to the Internet, or to untrusted network sources.

Severity ?

7.4 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE

CWE-215 - Insertion of Sensitive Information Into Debugging Code

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-14.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.15"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.12.0-RC.1, \u003c 2.12.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, if a nats-server is run with static credentials for all clients provided via argv (the command-line), then those credentials are visible to any user who can see the monitoring port, if that too is enabled. The `/debug/vars` end-point contains an unredacted copy of argv. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, configure credentials inside a configuration file instead of via argv, and do not enable the monitoring port if using secrets in argv. Best practice remains to not expose the monitoring port to the Internet, or to untrusted network sources."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-215",
              "description": "CWE-215: Insertion of Sensitive Information Into Debugging Code",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T20:02:18.868Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nats-io/nats-server/security/advisories/GHSA-x6g4-f6q3-fqvv",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-x6g4-f6q3-fqvv"
        },
        {
          "name": "https://advisories.nats.io/CVE/secnote-2026-14.txt",
          "tags": [
            "x_refsource_MISC"
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          "url": "https://advisories.nats.io/CVE/secnote-2026-14.txt"
        }
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      "source": {
        "advisory": "GHSA-x6g4-f6q3-fqvv",
        "discovery": "UNKNOWN"
      },
      "title": "NATS credentials are exposed in monitoring port via command-line argv"
    }
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    "dateUpdated": "2026-03-25T20:02:18.868Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-33246 (GCVE-0-2026-33246)

Vulnerability from nvd – Published: 2026-03-25 19:50 – Updated: 2026-03-25 19:50

Title

NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a `Nats-Request-Info:` message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

Severity ?

6.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CWE

CWE-287 - Improper Authentication
CWE-290 - Authentication Bypass by Spoofing

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-08.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.15"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.12.0-RC.1, \u003c 2.12.6"
            }
          ]
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            "attackComplexity": "LOW",
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            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
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              "description": "CWE-287: Improper Authentication",
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      "title": "NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers"
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CVE-2026-33219 (GCVE-0-2026-33219)

Vulnerability from nvd – Published: 2026-03-25 19:55 – Updated: 2026-03-25 20:10

Title

NATS is vulnerable to pre-auth DoS through WebSockets client service

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires sending a corresponding amount of data. This is a milder variant of CVE-2026-27571. That earlier issue was a compression bomb, this vulnerability is not. Attacks against this new issue thus require significant client bandwidth. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable websockets if not required for project deployment.

Severity ?

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-02.txt	x_refsource_MISC
	https://advisories.nats.io/CVE/secnote-2026-11.txt	x_refsource_MISC
	https://github.com/advisories/GHSA-qrvq-68c2-7grw	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33219",
                "options": [
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                    "Technical Impact": "partial"
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        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "attackComplexity": "LOW",
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CVE-2026-33218 (GCVE-0-2026-33218)

Vulnerability from nvd – Published: 2026-03-25 19:53 – Updated: 2026-03-25 19:53

Title

NATS has pre-auth server panic via leafnode handling

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable leafnode support if not needed or restrict network connections to the leafnode port, if plausible without compromising the service offered.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-20 - Improper Input Validation

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-10.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c \u003c 2.11.15"
            },
            {
              "status": "affected",
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            }
          ]
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        }
      ],
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          "cvssV3_1": {
            "attackComplexity": "LOW",
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          }
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      },
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}

CVE-2026-33217 (GCVE-0-2026-33217)

Vulnerability from nvd – Published: 2026-03-25 19:43 – Updated: 2026-03-25 20:08

Title

NATS allows MQTT clients to bypass ACL checks

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using ACLs on message subjects, these ACLs were not applied in the `$MQTT.>` namespace, allowing MQTT clients to bypass ACL checks for MQTT subjects. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

Severity ?

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-07.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33217",
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                  },
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        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "attackComplexity": "LOW",
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CVE-2026-33216 (GCVE-0-2026-33216)

Vulnerability from nvd – Published: 2026-03-25 19:41 – Updated: 2026-03-25 19:47

Title

NATS has MQTT plaintext password disclosure

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions 2.11.14 and 2.12.6 contain a fix. As a workaround, ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.

Severity ?

8.6 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CWE

CWE-256 - Plaintext Storage of a Password

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://github.com/nats-io/nats-server/commit/b5b…	x_refsource_MISC
	https://advisories.nats.io/CVE/secnote-2026-05.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
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CVE-2026-29785 (GCVE-0-2026-29785)

Vulnerability from nvd – Published: 2026-03-25 19:38 – Updated: 2026-03-25 19:40

Title

NATS Server panic via malicious compression on leafnode port

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the "leafnode" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used). Versions 2.11.14 and 2.12.5 contain a fix. As a workaround, disable compression on the leafnode port.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-476 - NULL Pointer Dereference

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://github.com/nats-io/nats-server/commit/a14…	x_refsource_MISC
	https://advisories.nats.io/CVE/secnote-2026-04.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.14 Affected: >= 2.12.0-RC.1, < 2.12.5

Show details on NVD website

JSON

To clipboard

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CVE-2026-27889 (GCVE-0-2026-27889)

Vulnerability from nvd – Published: 2026-03-25 19:36 – Updated: 2026-03-25 20:06

Title

NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-03.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: >= 2.2.0, < 2.11.14 Affected: >= 2.12.0, < 2.12.5

Show details on NVD website

JSON

To clipboard

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CVE-2026-33215 (GCVE-0-2026-33215)

Vulnerability from nvd – Published: 2026-03-24 20:55 – Updated: 2026-03-25 13:05

Title

NATS is vulnerable to MQTT hijacking via Client ID

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server provides an MQTT client interface. Prior to versions 2.11.15 and 2.12.5, Sessions and Messages can by hijacked via MQTT Client ID malfeasance. Versions 2.11.15 and 2.12.5 patch the issue. No known workarounds are available.

Severity ?

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L

CWE

CWE-287 - Improper Authentication
CWE-488 - Exposure of Data Element to Wrong Session

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-06.tx	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

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CVE-2026-27571 (GCVE-0-2026-27571)

Vulnerability from nvd – Published: 2026-02-24 15:59 – Updated: 2026-02-26 21:33

Title

nats-server websockets are vulnerable to pre-auth memory DoS

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The WebSockets handling of NATS messages handles compressed messages via the WebSockets negotiated compression. Prior to versions 2.11.2 and 2.12.3, the implementation bound the memory size of a NATS message but did not independently bound the memory consumption of the memory stream when constructing a NATS message which might then fail validation for size reasons. An attacker can use a compression bomb to cause excessive memory consumption, often resulting in the operating system terminating the server process. The use of compression is negotiated before authentication, so this does not require valid NATS credentials to exploit. The fix, present in versions 2.11.2 and 2.12.3, was to bounds the decompression to fail once the message was too large, instead of continuing on. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points.

Severity ?

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://github.com/nats-io/nats-server/commit/f77…	x_refsource_MISC
	https://github.com/nats-io/nats-server/releases/t…	x_refsource_MISC
	https://github.com/nats-io/nats-server/releases/t…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.12 Affected: >= 2.12.0-RC.1, < 2.12.3

Show details on NVD website

JSON

To clipboard

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                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-26T21:06:37.631926Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-26T21:33:40.372Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.12"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.12.0-RC.1, \u003c 2.12.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The WebSockets handling of NATS messages handles compressed messages via the WebSockets negotiated compression. Prior to versions 2.11.2 and 2.12.3, the implementation bound the memory size of a NATS message but did not independently bound the memory consumption of the memory stream when constructing a NATS message which might then fail validation for size reasons. An attacker can use a compression bomb to cause excessive memory consumption, often resulting in the operating system terminating the server process. The use of compression is negotiated before authentication, so this does not require valid NATS credentials to exploit. The fix, present in versions 2.11.2 and 2.12.3, was to bounds the decompression to fail once the message was too large, instead of continuing on. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
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      ],
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              "cweId": "CWE-409",
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              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
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            }
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        }
      ],
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          ],
          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-qrvq-68c2-7grw"
        },
        {
          "name": "https://github.com/nats-io/nats-server/commit/f77fb7c4535e6727cc1a2899cd8e6bbdd8ba2017",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nats-io/nats-server/commit/f77fb7c4535e6727cc1a2899cd8e6bbdd8ba2017"
        },
        {
          "name": "https://github.com/nats-io/nats-server/releases/tag/v2.11.12",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nats-io/nats-server/releases/tag/v2.11.12"
        },
        {
          "name": "https://github.com/nats-io/nats-server/releases/tag/v2.12.3",
          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/nats-io/nats-server/releases/tag/v2.12.3"
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      ],
      "source": {
        "advisory": "GHSA-qrvq-68c2-7grw",
        "discovery": "UNKNOWN"
      },
      "title": "nats-server websockets are vulnerable to pre-auth memory DoS"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-27571",
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    "dateReserved": "2026-02-20T17:40:28.448Z",
    "dateUpdated": "2026-02-26T21:33:40.372Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2025-30215 (GCVE-0-2025-30215)

Vulnerability from nvd – Published: 2025-04-15 23:25 – Updated: 2025-04-17 14:22

Title

NATS-Server Fails to Authorize Certain Jetstream Admin APIs

Summary

NATS-Server is a High-Performance server for NATS.io, the cloud and edge native messaging system. In versions starting from 2.2.0 but prior to 2.10.27 and 2.11.1, the management of JetStream assets happens with messages in the $JS. subject namespace in the system account; this is partially exposed into regular accounts to allow account holders to manage their assets. Some of the JS API requests were missing access controls, allowing any user with JS management permissions in any account to perform certain administrative actions on any JS asset in any other account. At least one of the unprotected APIs allows for data destruction. None of the affected APIs allow disclosing stream contents. This vulnerability is fixed in v2.11.1 or v2.10.27.

Severity ?

9.6 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

CWE

CWE-306 - Missing Authentication for Critical Function
CWE-287 - Improper Authentication

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2025-01.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: >= 2.2.0, < 2.10.27 Affected: >= 2.11.0-RC.1, < 2.11.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-04-16T00:12:20.161Z",
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        },
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          {
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          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-30215",
                "options": [
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                  },
                  {
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                  }
                ],
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                "version": "2.0.3"
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        ],
        "providerMetadata": {
          "dateUpdated": "2025-04-17T14:22:42.979Z",
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        },
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            "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-fhg8-qxh5-7q3w"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.2.0, \u003c 2.10.27"
            },
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              "status": "affected",
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            }
          ]
        }
      ],
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          "lang": "en",
          "value": "NATS-Server is a High-Performance server for NATS.io, the cloud and edge native messaging system. In versions starting from 2.2.0 but prior to 2.10.27 and 2.11.1, the management of JetStream assets happens with messages in the $JS. subject namespace in the system account; this is partially exposed into regular accounts to allow account holders to manage their assets. Some of the JS API requests were missing access controls, allowing any user with JS management permissions in any account to perform certain administrative actions on any JS asset in any other account. At least one of the unprotected APIs allows for data destruction. None of the affected APIs allow disclosing stream contents. This vulnerability is fixed in v2.11.1 or v2.10.27."
        }
      ],
      "metrics": [
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "confidentialityImpact": "NONE",
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            "privilegesRequired": "LOW",
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              "description": "CWE-306: Missing Authentication for Critical Function",
              "lang": "en",
              "type": "CWE"
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        },
        {
          "descriptions": [
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              "description": "CWE-287: Improper Authentication",
              "lang": "en",
              "type": "CWE"
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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          "tags": [
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          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-fhg8-qxh5-7q3w"
        },
        {
          "name": "https://advisories.nats.io/CVE/secnote-2025-01.txt",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://advisories.nats.io/CVE/secnote-2025-01.txt"
        }
      ],
      "source": {
        "advisory": "GHSA-fhg8-qxh5-7q3w",
        "discovery": "UNKNOWN"
      },
      "title": "NATS-Server Fails to Authorize Certain Jetstream Admin APIs"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
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    "dateReserved": "2025-03-18T18:15:13.850Z",
    "dateUpdated": "2025-04-17T14:22:42.979Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

CVE-2026-33249 (GCVE-0-2026-33249)

Vulnerability from cvelistv5 – Published: 2026-03-25 20:21 – Updated: 2026-03-25 20:21

Title

NATS: Message tracing can be redirected to arbitrary subject

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-15.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: >= 2.11.0, < 2.11.15 Affected: >= 2.12.0-preview.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.11.0, \u003c 2.11.15"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.12.0-preview.1, \u003c 2.12.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T20:21:30.156Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
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          "name": "https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-8m2x-3m6q-6w8j"
        },
        {
          "name": "https://advisories.nats.io/CVE/secnote-2026-15.txt",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://advisories.nats.io/CVE/secnote-2026-15.txt"
        }
      ],
      "source": {
        "advisory": "GHSA-8m2x-3m6q-6w8j",
        "discovery": "UNKNOWN"
      },
      "title": "NATS: Message tracing can be redirected to arbitrary subject"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33249",
    "datePublished": "2026-03-25T20:21:30.156Z",
    "dateReserved": "2026-03-18T02:42:27.509Z",
    "dateUpdated": "2026-03-25T20:21:30.156Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-33223 (GCVE-0-2026-33223)

Vulnerability from cvelistv5 – Published: 2026-03-25 20:20 – Updated: 2026-03-25 20:20

Title

NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, the NATS message header `Nats-Request-Info:` is supposed to be a guarantee of identity by the NATS server, but the stripping of this header from inbound messages was not fully effective. An attacker with valid credentials for any regular client interface could thus spoof their identity to services which rely upon this header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

Severity ?

6.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CWE

CWE-290 - Authentication Bypass by Spoofing

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-09.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.15"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.12.0-RC.1, \u003c 2.12.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, the NATS message header `Nats-Request-Info:` is supposed to be a guarantee of identity by the NATS server, but the stripping of this header from inbound messages was not fully effective. An attacker with valid credentials for any regular client interface could thus spoof their identity to services which rely upon this header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-290",
              "description": "CWE-290: Authentication Bypass by Spoofing",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T20:20:00.158Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/nats-io/nats-server/security/advisories/GHSA-pwx7-fx9r-hr4h",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-pwx7-fx9r-hr4h"
        },
        {
          "name": "https://advisories.nats.io/CVE/secnote-2026-09.txt",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://advisories.nats.io/CVE/secnote-2026-09.txt"
        }
      ],
      "source": {
        "advisory": "GHSA-pwx7-fx9r-hr4h",
        "discovery": "UNKNOWN"
      },
      "title": "NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33223",
    "datePublished": "2026-03-25T20:20:00.158Z",
    "dateReserved": "2026-03-17T23:23:58.315Z",
    "dateUpdated": "2026-03-25T20:20:00.158Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-33248 (GCVE-0-2026-33248)

Vulnerability from cvelistv5 – Published: 2026-03-25 20:18 – Updated: 2026-03-25 20:18

Title

NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using mTLS for client identity, with `verify_and_map` to derive a NATS identity from the client certificate's Subject DN, certain patterns of RDN would not be correctly enforced, allowing for authentication bypass. This does require a valid certificate from a CA already trusted for client certificates, and `DN` naming patterns which the NATS maintainers consider highly unlikely. So this is an unlikely attack. Nonetheless, administrators who have been very sophisticated in their `DN` construction patterns might conceivably be impacted. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, developers should review their CA issuing practices.

Severity ?

4.2 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CWE

CWE-287 - Improper Authentication
CWE-295 - Improper Certificate Validation

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-13.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.15"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.12.0-RC.1, \u003c 2.12.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using mTLS for client identity, with `verify_and_map` to derive a NATS identity from the client certificate\u0027s Subject DN, certain patterns of RDN would not be correctly enforced, allowing for authentication bypass. This does require a valid certificate from a CA already trusted for client certificates, and `DN` naming patterns which the NATS maintainers consider highly unlikely. So this is an unlikely attack. Nonetheless, administrators who have been very sophisticated in their `DN` construction patterns might conceivably be impacted. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, developers should review their CA issuing practices."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.2,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N",
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          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-287",
              "description": "CWE-287: Improper Authentication",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-295",
              "description": "CWE-295: Improper Certificate Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T20:18:28.923Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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          "name": "https://github.com/nats-io/nats-server/security/advisories/GHSA-3f24-pcvm-5jqc",
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          ],
          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-3f24-pcvm-5jqc"
        },
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          "tags": [
            "x_refsource_MISC"
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          "url": "https://advisories.nats.io/CVE/secnote-2026-13.txt"
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      ],
      "source": {
        "advisory": "GHSA-3f24-pcvm-5jqc",
        "discovery": "UNKNOWN"
      },
      "title": "NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "datePublished": "2026-03-25T20:18:28.923Z",
    "dateReserved": "2026-03-18T02:42:27.509Z",
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    "state": "PUBLISHED"
  },
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}

CVE-2026-33222 (GCVE-0-2026-33222)

Vulnerability from cvelistv5 – Published: 2026-03-25 20:10 – Updated: 2026-03-25 20:10

Title

NATS JetStream has an authorization bypass through its Management API

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, users with JetStream admin API access to restore one stream could restore to other stream names, impacting data which should have been protected against them. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, if developers have configured users to have limited JetStream restore permissions, temporarily remove those permissions.

Severity ?

4.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

CWE

CWE-285 - Improper Authorization

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-12.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.15"
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            }
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        }
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          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
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          }
        }
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          "descriptions": [
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              "cweId": "CWE-285",
              "description": "CWE-285: Improper Authorization",
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            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-25T20:10:51.107Z",
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          "tags": [
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      ],
      "source": {
        "advisory": "GHSA-9983-vrx2-fg9c",
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    "dateReserved": "2026-03-17T23:23:58.315Z",
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  },
  "dataType": "CVE_RECORD",
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}

CVE-2026-33247 (GCVE-0-2026-33247)

Vulnerability from cvelistv5 – Published: 2026-03-25 20:02 – Updated: 2026-03-25 20:02

Title

NATS credentials are exposed in monitoring port via command-line argv

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, if a nats-server is run with static credentials for all clients provided via argv (the command-line), then those credentials are visible to any user who can see the monitoring port, if that too is enabled. The `/debug/vars` end-point contains an unredacted copy of argv. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, configure credentials inside a configuration file instead of via argv, and do not enable the monitoring port if using secrets in argv. Best practice remains to not expose the monitoring port to the Internet, or to untrusted network sources.

Severity ?

7.4 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE

CWE-215 - Insertion of Sensitive Information Into Debugging Code

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-14.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.15"
            },
            {
              "status": "affected",
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        }
      ],
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          "cvssV3_1": {
            "attackComplexity": "HIGH",
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              "cweId": "CWE-215",
              "description": "CWE-215: Insertion of Sensitive Information Into Debugging Code",
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        "dateUpdated": "2026-03-25T20:02:18.868Z",
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          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-x6g4-f6q3-fqvv"
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          "tags": [
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          "url": "https://advisories.nats.io/CVE/secnote-2026-14.txt"
        }
      ],
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        "advisory": "GHSA-x6g4-f6q3-fqvv",
        "discovery": "UNKNOWN"
      },
      "title": "NATS credentials are exposed in monitoring port via command-line argv"
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    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "dateReserved": "2026-03-18T02:42:27.509Z",
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    "state": "PUBLISHED"
  },
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}

CVE-2026-33219 (GCVE-0-2026-33219)

Vulnerability from cvelistv5 – Published: 2026-03-25 19:55 – Updated: 2026-03-25 20:10

Title

NATS is vulnerable to pre-auth DoS through WebSockets client service

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires sending a corresponding amount of data. This is a milder variant of CVE-2026-27571. That earlier issue was a compression bomb, this vulnerability is not. Attacks against this new issue thus require significant client bandwidth. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable websockets if not required for project deployment.

Severity ?

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-02.txt	x_refsource_MISC
	https://advisories.nats.io/CVE/secnote-2026-11.txt	x_refsource_MISC
	https://github.com/advisories/GHSA-qrvq-68c2-7grw	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-33219",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
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        }
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            "attackComplexity": "LOW",
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CVE-2026-33218 (GCVE-0-2026-33218)

Vulnerability from cvelistv5 – Published: 2026-03-25 19:53 – Updated: 2026-03-25 19:53

Title

NATS has pre-auth server panic via leafnode handling

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable leafnode support if not needed or restrict network connections to the leafnode port, if plausible without compromising the service offered.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-20 - Improper Input Validation

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-10.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c \u003c 2.11.15"
            },
            {
              "status": "affected",
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            }
          ]
        }
      ],
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        }
      ],
      "metrics": [
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          }
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    "cveId": "CVE-2026-33218",
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    "dateReserved": "2026-03-17T23:23:58.314Z",
    "dateUpdated": "2026-03-25T19:53:12.075Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-33246 (GCVE-0-2026-33246)

Vulnerability from cvelistv5 – Published: 2026-03-25 19:50 – Updated: 2026-03-25 19:50

Title

NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a `Nats-Request-Info:` message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

Severity ?

6.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CWE

CWE-287 - Improper Authentication
CWE-290 - Authentication Bypass by Spoofing

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-08.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.15"
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              "status": "affected",
              "version": "\u003e= 2.12.0-RC.1, \u003c 2.12.6"
            }
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        }
      ],
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          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
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          }
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          "descriptions": [
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              "cweId": "CWE-290",
              "description": "CWE-290: Authentication Bypass by Spoofing",
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              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-03-25T19:50:03.453Z",
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          "tags": [
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          "url": "https://advisories.nats.io/CVE/secnote-2026-08.txt"
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      "source": {
        "advisory": "GHSA-55h8-8g96-x4hj",
        "discovery": "UNKNOWN"
      },
      "title": "NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers"
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    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "cveId": "CVE-2026-33246",
    "datePublished": "2026-03-25T19:50:03.453Z",
    "dateReserved": "2026-03-18T02:42:27.509Z",
    "dateUpdated": "2026-03-25T19:50:03.453Z",
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  },
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}

CVE-2026-33217 (GCVE-0-2026-33217)

Vulnerability from cvelistv5 – Published: 2026-03-25 19:43 – Updated: 2026-03-25 20:08

Title

NATS allows MQTT clients to bypass ACL checks

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using ACLs on message subjects, these ACLs were not applied in the `$MQTT.>` namespace, allowing MQTT clients to bypass ACL checks for MQTT subjects. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

Severity ?

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-07.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
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              "content": {
                "id": "CVE-2026-33217",
                "options": [
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                    "Automatable": "no"
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                    "Technical Impact": "partial"
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                "timestamp": "2026-03-25T20:07:59.832372Z",
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        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "attackComplexity": "LOW",
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            "baseSeverity": "HIGH",
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CVE-2026-33216 (GCVE-0-2026-33216)

Vulnerability from cvelistv5 – Published: 2026-03-25 19:41 – Updated: 2026-03-25 19:47

Title

NATS has MQTT plaintext password disclosure

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions 2.11.14 and 2.12.6 contain a fix. As a workaround, ensure monitoring end-points are adequately secured. Best practice remains to not expose the monitoring endpoint to the Internet or other untrusted network users.

Severity ?

8.6 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CWE

CWE-256 - Plaintext Storage of a Password

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://github.com/nats-io/nats-server/commit/b5b…	x_refsource_MISC
	https://advisories.nats.io/CVE/secnote-2026-05.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.15"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.12.0-RC.1, \u003c 2.12.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
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        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.6,
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            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
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          "descriptions": [
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              "cweId": "CWE-256",
              "description": "CWE-256: Plaintext Storage of a Password",
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              "type": "CWE"
            }
          ]
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      ],
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        "dateUpdated": "2026-03-25T19:47:49.517Z",
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          ],
          "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-v722-jcv5-w7mc"
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          "tags": [
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            "x_refsource_MISC"
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}

CVE-2026-29785 (GCVE-0-2026-29785)

Vulnerability from cvelistv5 – Published: 2026-03-25 19:38 – Updated: 2026-03-25 19:40

Title

NATS Server panic via malicious compression on leafnode port

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the "leafnode" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used). Versions 2.11.14 and 2.12.5 contain a fix. As a workaround, disable compression on the leafnode port.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-476 - NULL Pointer Dereference

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://github.com/nats-io/nats-server/commit/a14…	x_refsource_MISC
	https://advisories.nats.io/CVE/secnote-2026-04.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.14 Affected: >= 2.12.0-RC.1, < 2.12.5

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nats-server",
          "vendor": "nats-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.14"
            },
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              "status": "affected",
              "version": "\u003e= 2.12.0-RC.1, \u003c 2.12.5"
            }
          ]
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        }
      ],
      "metrics": [
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            "attackVector": "NETWORK",
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          "url": "https://advisories.nats.io/CVE/secnote-2026-04.txt"
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        "advisory": "GHSA-52jh-2xxh-pwh6",
        "discovery": "UNKNOWN"
      },
      "title": "NATS Server panic via malicious compression on leafnode port"
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    "dateUpdated": "2026-03-25T19:40:51.282Z",
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  },
  "dataType": "CVE_RECORD",
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}

CVE-2026-27889 (GCVE-0-2026-27889)

Vulnerability from cvelistv5 – Published: 2026-03-25 19:36 – Updated: 2026-03-25 20:06

Title

NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-03.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: >= 2.2.0, < 2.11.14 Affected: >= 2.12.0, < 2.12.5

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-27889",
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                  },
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                    "Technical Impact": "partial"
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CVE-2026-33215 (GCVE-0-2026-33215)

Vulnerability from cvelistv5 – Published: 2026-03-24 20:55 – Updated: 2026-03-25 13:05

Title

NATS is vulnerable to MQTT hijacking via Client ID

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server provides an MQTT client interface. Prior to versions 2.11.15 and 2.12.5, Sessions and Messages can by hijacked via MQTT Client ID malfeasance. Versions 2.11.15 and 2.12.5 patch the issue. No known workarounds are available.

Severity ?

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L

CWE

CWE-287 - Improper Authentication
CWE-488 - Exposure of Data Element to Wrong Session

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2026-06.tx	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.15 Affected: >= 2.12.0-RC.1, < 2.12.6

Show details on NVD website

JSON

To clipboard

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CVE-2026-27571 (GCVE-0-2026-27571)

Vulnerability from cvelistv5 – Published: 2026-02-24 15:59 – Updated: 2026-02-26 21:33

Title

nats-server websockets are vulnerable to pre-auth memory DoS

Summary

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The WebSockets handling of NATS messages handles compressed messages via the WebSockets negotiated compression. Prior to versions 2.11.2 and 2.12.3, the implementation bound the memory size of a NATS message but did not independently bound the memory consumption of the memory stream when constructing a NATS message which might then fail validation for size reasons. An attacker can use a compression bomb to cause excessive memory consumption, often resulting in the operating system terminating the server process. The use of compression is negotiated before authentication, so this does not require valid NATS credentials to exploit. The fix, present in versions 2.11.2 and 2.12.3, was to bounds the decompression to fail once the message was too large, instead of continuing on. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points.

Severity ?

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://github.com/nats-io/nats-server/commit/f77…	x_refsource_MISC
	https://github.com/nats-io/nats-server/releases/t…	x_refsource_MISC
	https://github.com/nats-io/nats-server/releases/t…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: < 2.11.12 Affected: >= 2.12.0-RC.1, < 2.12.3

Show details on NVD website

JSON

To clipboard

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CVE-2025-30215 (GCVE-0-2025-30215)

Vulnerability from cvelistv5 – Published: 2025-04-15 23:25 – Updated: 2025-04-17 14:22

Title

NATS-Server Fails to Authorize Certain Jetstream Admin APIs

Summary

NATS-Server is a High-Performance server for NATS.io, the cloud and edge native messaging system. In versions starting from 2.2.0 but prior to 2.10.27 and 2.11.1, the management of JetStream assets happens with messages in the $JS. subject namespace in the system account; this is partially exposed into regular accounts to allow account holders to manage their assets. Some of the JS API requests were missing access controls, allowing any user with JS management permissions in any account to perform certain administrative actions on any JS asset in any other account. At least one of the unprotected APIs allows for data destruction. None of the affected APIs allow disclosing stream contents. This vulnerability is fixed in v2.11.1 or v2.10.27.

Severity ?

9.6 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

CWE

CWE-306 - Missing Authentication for Critical Function
CWE-287 - Improper Authentication

Assigner

GitHub_M

References

URL

Tags

	https://github.com/nats-io/nats-server/security/a…	x_refsource_CONFIRM
	https://advisories.nats.io/CVE/secnote-2025-01.txt	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nats-io	nats-server	Affected: >= 2.2.0, < 2.10.27 Affected: >= 2.11.0-RC.1, < 2.11.1

Show details on NVD website

JSON

To clipboard

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    "cveId": "CVE-2025-30215",
    "datePublished": "2025-04-15T23:25:43.143Z",
    "dateReserved": "2025-03-18T18:15:13.850Z",
    "dateUpdated": "2025-04-17T14:22:42.979Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Search criteria ⓘ Use full-text search for keyword queries. Combine vendor, product, and sources to narrow results. Enable “Apply ordering” to sort by dates instead of relevance.

30 vulnerabilities found for nats-server by nats-io

CVE-2026-33249 (GCVE-0-2026-33249)

CVE-2026-33248 (GCVE-0-2026-33248)

CVE-2026-33223 (GCVE-0-2026-33223)

CVE-2026-33222 (GCVE-0-2026-33222)

CVE-2026-33247 (GCVE-0-2026-33247)

CVE-2026-33246 (GCVE-0-2026-33246)

CVE-2026-33219 (GCVE-0-2026-33219)

CVE-2026-33218 (GCVE-0-2026-33218)

CVE-2026-33217 (GCVE-0-2026-33217)

CVE-2026-33216 (GCVE-0-2026-33216)

CVE-2026-29785 (GCVE-0-2026-29785)

CVE-2026-27889 (GCVE-0-2026-27889)

CVE-2026-33215 (GCVE-0-2026-33215)

CVE-2026-27571 (GCVE-0-2026-27571)

CVE-2025-30215 (GCVE-0-2025-30215)

CVE-2026-33249 (GCVE-0-2026-33249)

CVE-2026-33223 (GCVE-0-2026-33223)

CVE-2026-33248 (GCVE-0-2026-33248)

CVE-2026-33222 (GCVE-0-2026-33222)

CVE-2026-33247 (GCVE-0-2026-33247)

CVE-2026-33219 (GCVE-0-2026-33219)

CVE-2026-33218 (GCVE-0-2026-33218)

CVE-2026-33246 (GCVE-0-2026-33246)

CVE-2026-33217 (GCVE-0-2026-33217)

CVE-2026-33216 (GCVE-0-2026-33216)

CVE-2026-29785 (GCVE-0-2026-29785)

CVE-2026-27889 (GCVE-0-2026-27889)

CVE-2026-33215 (GCVE-0-2026-33215)

CVE-2026-27571 (GCVE-0-2026-27571)

CVE-2025-30215 (GCVE-0-2025-30215)

Search criteria ⓘ Use full-text search for keyword queries.
Combine vendor, product, and sources to narrow results.
Enable “Apply ordering” to sort by dates instead of relevance.