Vulnerability-Lookup

CVE-2026-59818 (GCVE-0-2026-59818)

Vulnerability from cvelistv5 – Published: 2026-07-08 21:00 – Updated: 2026-07-09 13:13

Title

etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation

Summary

etcd is a distributed key-value store for the data of a distributed system. Prior to 3.5.32 and 3.6.13, when etcd is configured with --listen-client-http-urls to split HTTP and gRPC client endpoints onto separate listeners, the --client-crl-file Certificate Revocation List is not enforced on the gRPC listener, allowing a client with a revoked certificate to authenticate successfully over gRPC. This issue is fixed in versions 3.5.32 and 3.6.13.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-295 - Improper Certificate Validation

Assigner

GitHub_M

References

9 references

URL	Tags
https://github.com/etcd-io/etcd/security/advisori…	x_refsource_CONFIRM
https://github.com/etcd-io/etcd/pull/22007	x_refsource_MISC
https://github.com/etcd-io/etcd/pull/22021	x_refsource_MISC
https://github.com/etcd-io/etcd/pull/22025	x_refsource_MISC
https://github.com/etcd-io/etcd/commit/2308ce1578…	x_refsource_MISC
https://github.com/etcd-io/etcd/commit/24838af5a5…	x_refsource_MISC
https://github.com/etcd-io/etcd/commit/8221ae82bc…	x_refsource_MISC
https://github.com/etcd-io/etcd/releases/tag/v3.5.32	x_refsource_MISC
https://github.com/etcd-io/etcd/releases/tag/v3.6.13	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
etcd-io	etcd	Affected: >= 3.6.0-alpha.0, < 3.6.13 Affected: < 3.5.32

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-59818

Vulnerability from fkie_nvd - Published: 2026-07-08 21:16 - Updated: 2026-07-10 19:03

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/etcd-io/etcd/commit/2308ce1578064641d4d67c40f0487309267d1bef
	security-advisories@github.com	https://github.com/etcd-io/etcd/commit/24838af5a53dd0245adced920e42a9bf0e7a267f
	security-advisories@github.com	https://github.com/etcd-io/etcd/commit/8221ae82bc25d4d55ca64382207b69be71038cbb
	security-advisories@github.com	https://github.com/etcd-io/etcd/pull/22007
	security-advisories@github.com	https://github.com/etcd-io/etcd/pull/22021
	security-advisories@github.com	https://github.com/etcd-io/etcd/pull/22025
	security-advisories@github.com	https://github.com/etcd-io/etcd/releases/tag/v3.5.32
	security-advisories@github.com	https://github.com/etcd-io/etcd/releases/tag/v3.6.13
	security-advisories@github.com	https://github.com/etcd-io/etcd/security/advisories/GHSA-3wh4-j44w-pg92

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "etcd",
          "vendor": "etcd-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.6.0-alpha.0, \u003c 3.6.13"
            },
            {
              "status": "affected",
              "version": "\u003c 3.5.32"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "etcd is a distributed key-value store for the data of a distributed system. Prior to 3.5.32 and 3.6.13, when etcd is configured with --listen-client-http-urls to split HTTP and gRPC client endpoints onto separate listeners, the --client-crl-file Certificate Revocation List is not enforced on the gRPC listener, allowing a client with a revoked certificate to authenticate successfully over gRPC. This issue is fixed in versions 3.5.32 and 3.6.13."
    }
  ],
  "id": "CVE-2026-59818",
  "lastModified": "2026-07-10T19:03:20.407",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
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      "url": "https://github.com/etcd-io/etcd/commit/2308ce1578064641d4d67c40f0487309267d1bef"
    },
    {
      "source": "security-advisories@github.com",
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      "source": "security-advisories@github.com",
      "url": "https://github.com/etcd-io/etcd/pull/22021"
    },
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      "source": "security-advisories@github.com",
      "url": "https://github.com/etcd-io/etcd/pull/22025"
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}

MSRC_CVE-2026-59818

Vulnerability from csaf_microsoft - Published: 2026-07-02 00:00 - Updated: 2026-07-10 01:01

Summary

etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-59818

6.5 (Medium)


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

CWE-295 - Improper Certificate Validation

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: 17084-1		—	None Available

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-59818 etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-59818.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation",
    "tracking": {
      "current_release_date": "2026-07-10T01:01:17.000Z",
      "generator": {
        "date": "2026-07-10T07:26:22.197Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-59818",
      "initial_release_date": "2026-07-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-07-10T01:01:17.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
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            "branches": [
              {
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                "product": {
                  "name": "Azure Linux 3.0",
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                }
              }
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            "category": "product_name",
            "name": "Azure Linux"
          },
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                "name": "azl3 etcd 0:3.5.30-2.azl3",
                "product": {
                  "name": "azl3 etcd 0:3.5.30-2.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "etcd"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 etcd 0:3.5.30-2.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-59818",
      "cwe": {
        "id": "CWE-295",
        "name": "Improper Certificate Validation"
      },
      "notes": [
        {
          "category": "general",
          "text": "GitHub_M",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-59818 etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-59818.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-07-10T01:01:17.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "temporalScore": 6.5,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "17084-1"
          ]
        }
      ],
      "title": "etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-59818 (GCVE-0-2026-59818)

FKIE_CVE-2026-59818

MSRC_CVE-2026-59818

Tags

Sightings

Nomenclature