Vulnerability-Lookup

FKIE_CVE-2026-73499

Vulnerability from fkie_nvd - Published: 2026-08-12 22:17 - Updated: 2026-08-14 23:16

Severity

7.1 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Summary

etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, and 3.7.1, a user granted READ permission on a single exact key can use the Watch gRPC API with clientv3.WithFromKey() to receive watch events for every key lexicographically greater than or equal to the permitted key. In server/etcdserver/api/v3rpc/watch.go, the open-ended RangeEnd sentinel is rewritten before the RBAC permission check in server/auth/range_perm_cache.go function isRangeOpPermitted, causing the request to be treated as an exact-key watch. Range/Get and DeleteRange requests are not affected, and the issue affects only clusters with authentication enabled. This issue is fixed in versions 3.5.33, 3.6.14, and 3.7.1.

References

	URL	Tags
	security-advisories@github.com	https://github.com/etcd-io/etcd/commit/6643f80602461a6095c9b294b6512fd9719bef41
	security-advisories@github.com	https://github.com/etcd-io/etcd/commit/7cf71ec9e2ec54230a5454392fa4ffd4574b41ed
	security-advisories@github.com	https://github.com/etcd-io/etcd/commit/afeaa624da19085b47fb5ccc7c22a8c421bc2eae
	security-advisories@github.com	https://github.com/etcd-io/etcd/commit/e863b001bbf3367003a543aa3099db9892134cd7
	security-advisories@github.com	https://github.com/etcd-io/etcd/releases/tag/v3.5.33
	security-advisories@github.com	https://github.com/etcd-io/etcd/releases/tag/v3.6.14
	security-advisories@github.com	https://github.com/etcd-io/etcd/releases/tag/v3.7.1
	security-advisories@github.com	https://github.com/etcd-io/etcd/security/advisories/GHSA-xg4h-6gfc-h4m8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "etcd",
          "vendor": "etcd-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.5.33"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.6.0, \u003c 3.6.14"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.7.0-alpha.0, \u003c 3.7.1"
            }
          ]
        }
      ],
      "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 versions 3.5.33, 3.6.14, and 3.7.1, a user granted READ permission on a single exact key can use the Watch gRPC API with clientv3.WithFromKey() to receive watch events for every key lexicographically greater than or equal to the permitted key. In server/etcdserver/api/v3rpc/watch.go, the open-ended RangeEnd sentinel is rewritten before the RBAC permission check in server/auth/range_perm_cache.go function isRangeOpPermitted, causing the request to be treated as an exact-key watch. Range/Get and DeleteRange requests are not affected, and the issue affects only clusters with authentication enabled. This issue is fixed in versions 3.5.33, 3.6.14, and 3.7.1."
    }
  ],
  "id": "CVE-2026-73499",
  "lastModified": "2026-08-14T23:16:33.477",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-73499",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-14T22:19:48.980697Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-12T22:17:17.130",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/etcd-io/etcd/commit/6643f80602461a6095c9b294b6512fd9719bef41"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/etcd-io/etcd/commit/7cf71ec9e2ec54230a5454392fa4ffd4574b41ed"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/etcd-io/etcd/commit/afeaa624da19085b47fb5ccc7c22a8c421bc2eae"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/etcd-io/etcd/commit/e863b001bbf3367003a543aa3099db9892134cd7"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/etcd-io/etcd/releases/tag/v3.5.33"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/etcd-io/etcd/releases/tag/v3.6.14"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/etcd-io/etcd/releases/tag/v3.7.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/etcd-io/etcd/security/advisories/GHSA-xg4h-6gfc-h4m8"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

CVE-2026-73499 (GCVE-0-2026-73499)

Vulnerability from cvelistv5 – Published: 2026-08-12 21:20 – Updated: 2026-08-14 22:19

Title

etcd: Watch API authorization bypass via open-ended range requests

Summary

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-14 22:19 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

8 references

URL	Tags
https://github.com/etcd-io/etcd/security/advisori…	x_refsource_CONFIRM
https://github.com/etcd-io/etcd/commit/6643f80602…	x_refsource_MISC
https://github.com/etcd-io/etcd/commit/7cf71ec9e2…	x_refsource_MISC
https://github.com/etcd-io/etcd/commit/afeaa624da…	x_refsource_MISC
https://github.com/etcd-io/etcd/commit/e863b001bb…	x_refsource_MISC
https://github.com/etcd-io/etcd/releases/tag/v3.5.33	x_refsource_MISC
https://github.com/etcd-io/etcd/releases/tag/v3.6.14	x_refsource_MISC
https://github.com/etcd-io/etcd/releases/tag/v3.7.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
etcd-io	etcd	Affected: < 3.5.33 Affected: >= 3.6.0, < 3.6.14 Affected: >= 3.7.0-alpha.0, < 3.7.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-73499",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-14T22:19:48.980697Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-14T22:19:59.624Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "etcd",
          "vendor": "etcd-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.5.33"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.6.0, \u003c 3.6.14"
            },
            {
              "status": "affected",
              "version": "\u003e= 3.7.0-alpha.0, \u003c 3.7.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.5.33, 3.6.14, and 3.7.1, a user granted READ permission on a single exact key can use the Watch gRPC API with clientv3.WithFromKey() to receive watch events for every key lexicographically greater than or equal to the permitted key. In server/etcdserver/api/v3rpc/watch.go, the open-ended RangeEnd sentinel is rewritten before the RBAC permission check in server/auth/range_perm_cache.go function isRangeOpPermitted, causing the request to be treated as an exact-key watch. Range/Get and DeleteRange requests are not affected, and the issue affects only clusters with authentication enabled. This issue is fixed in versions 3.5.33, 3.6.14, and 3.7.1."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-12T21:20:31.888Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/etcd-io/etcd/security/advisories/GHSA-xg4h-6gfc-h4m8",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/etcd-io/etcd/security/advisories/GHSA-xg4h-6gfc-h4m8"
        },
        {
          "name": "https://github.com/etcd-io/etcd/commit/6643f80602461a6095c9b294b6512fd9719bef41",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/etcd-io/etcd/commit/6643f80602461a6095c9b294b6512fd9719bef41"
        },
        {
          "name": "https://github.com/etcd-io/etcd/commit/7cf71ec9e2ec54230a5454392fa4ffd4574b41ed",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/etcd-io/etcd/commit/7cf71ec9e2ec54230a5454392fa4ffd4574b41ed"
        },
        {
          "name": "https://github.com/etcd-io/etcd/commit/afeaa624da19085b47fb5ccc7c22a8c421bc2eae",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/etcd-io/etcd/commit/afeaa624da19085b47fb5ccc7c22a8c421bc2eae"
        },
        {
          "name": "https://github.com/etcd-io/etcd/commit/e863b001bbf3367003a543aa3099db9892134cd7",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/etcd-io/etcd/commit/e863b001bbf3367003a543aa3099db9892134cd7"
        },
        {
          "name": "https://github.com/etcd-io/etcd/releases/tag/v3.5.33",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/etcd-io/etcd/releases/tag/v3.5.33"
        },
        {
          "name": "https://github.com/etcd-io/etcd/releases/tag/v3.6.14",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/etcd-io/etcd/releases/tag/v3.6.14"
        },
        {
          "name": "https://github.com/etcd-io/etcd/releases/tag/v3.7.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/etcd-io/etcd/releases/tag/v3.7.1"
        }
      ],
      "source": {
        "advisory": "GHSA-xg4h-6gfc-h4m8",
        "discovery": "UNKNOWN"
      },
      "title": "etcd: Watch API authorization bypass via open-ended range requests"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-73499",
    "datePublished": "2026-08-12T21:20:31.888Z",
    "dateReserved": "2026-08-12T19:00:33.736Z",
    "dateUpdated": "2026-08-14T22:19:59.624Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

FKIE_CVE-2026-73499

CVE-2026-73499 (GCVE-0-2026-73499)

Tags

Sightings

Nomenclature