CVE-2026-73511 (GCVE-0-2026-73511)

Vulnerability from cvelistv5 – Published: 2026-09-21 20:20 – Updated: 2026-09-21 20:20
VLAI
Title
Envoy: Potential path-matching/authentication bypass when using Envoy in combination with a backend stripping per-segment path (matrix) parameters (e.g. Apache Tomcat)
Summary
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy normally matches the raw request path, while servlet backends such as Apache Tomcat strip semicolon matrix parameters from each path segment before resolving the resource. Envoy's ignore_path_parameters_in_path_matching option instead truncates at the first semicolon and still does not match per-segment backend behavior. A remote client can use a parameterized protected segment, or a parameter on an earlier segment, to make Envoy select an unprotected fallback while the backend resolves the protected resource. The relevant scope boundary is that the bypass requires both a path-based Envoy decision and a backend that strips semicolon parameters per segment. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-289 - Authentication Bypass by Alternate Name
  • CWE-436 - Interpretation Conflict
Assigner
References
Impacted products
Vendor Product Version CPE status
envoyproxy envoy Affected: < 1.36.10
Affected: >= 1.37.0, < 1.37.6
Affected: >= 1.38.0, < 1.38.4
Affected: >= 1.39.0, < 1.39.1
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "envoy",
          "vendor": "envoyproxy",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.36.10"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.37.0, \u003c 1.37.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.38.0, \u003c 1.38.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.39.0, \u003c 1.39.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy normally matches the raw request path, while servlet backends such as Apache Tomcat strip semicolon matrix parameters from each path segment before resolving the resource. Envoy\u0027s ignore_path_parameters_in_path_matching option instead truncates at the first semicolon and still does not match per-segment backend behavior. A remote client can use a parameterized protected segment, or a parameter on an earlier segment, to make Envoy select an unprotected fallback while the backend resolves the protected resource. The relevant scope boundary is that the bypass requires both a path-based Envoy decision and a backend that strips semicolon parameters per segment. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-289",
              "description": "CWE-289: Authentication Bypass by Alternate Name",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-436",
              "description": "CWE-436: Interpretation Conflict",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-21T20:20:26.487Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-m745-gh6x-349x",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-m745-gh6x-349x"
        },
        {
          "name": "https://github.com/envoyproxy/envoy/commit/26d5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/envoyproxy/envoy/commit/26d5"
        },
        {
          "name": "https://github.com/envoyproxy/envoy/commit/50f7bfa48dccfee339822e9846b2b8053e07d325",
          "tags": [
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          ],
          "url": "https://github.com/envoyproxy/envoy/commit/50f7bfa48dccfee339822e9846b2b8053e07d325"
        },
        {
          "name": "https://github.com/envoyproxy/envoy/commit/b205d1f4982e14ce5693ba94ef84d37e7155e050",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/envoyproxy/envoy/commit/b205d1f4982e14ce5693ba94ef84d37e7155e050"
        },
        {
          "name": "https://github.com/envoyproxy/envoy/commit/fcb663752c7055257f5dcc8b6ce6c7c905ebb1ff",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/envoyproxy/envoy/commit/fcb663752c7055257f5dcc8b6ce6c7c905ebb1ff"
        },
        {
          "name": "https://github.com/envoyproxy/envoy/releases/tag/v1.36.10",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.36.10"
        },
        {
          "name": "https://github.com/envoyproxy/envoy/releases/tag/v1.37.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.37.6"
        },
        {
          "name": "https://github.com/envoyproxy/envoy/releases/tag/v1.38.4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.38.4"
        },
        {
          "name": "https://github.com/envoyproxy/envoy/releases/tag/v1.39.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.39.1"
        }
      ],
      "source": {
        "advisory": "GHSA-m745-gh6x-349x",
        "discovery": "UNKNOWN"
      },
      "title": "Envoy: Potential path-matching/authentication bypass when using Envoy in combination with a backend stripping per-segment path (matrix) parameters (e.g. Apache Tomcat)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-73511",
    "datePublished": "2026-09-21T20:20:26.487Z",
    "dateReserved": "2026-08-12T19:00:33.736Z",
    "dateUpdated": "2026-09-21T20:20:26.487Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "envoy",
                "vendor": "envoyproxy",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 1.36.10"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 1.37.0, \u003c 1.37.6"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 1.38.0, \u003c 1.38.4"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 1.39.0, \u003c 1.39.1"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy normally matches the raw request path, while servlet backends such as Apache Tomcat strip semicolon matrix parameters from each path segment before resolving the resource. Envoy\u0027s ignore_path_parameters_in_path_matching option instead truncates at the first semicolon and still does not match per-segment backend behavior. A remote client can use a parameterized protected segment, or a parameter on an earlier segment, to make Envoy select an unprotected fallback while the backend resolves the protected resource. The relevant scope boundary is that the bypass requires both a path-based Envoy decision and a backend that strips semicolon parameters per segment. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1."
          }
        ],
        "id": "CVE-2026-73511",
        "lastModified": "2026-09-21T21:17:09.207",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                "version": "3.1"
              },
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              "impactScore": 1.4,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
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        },
        "published": "2026-09-21T21:17:09.207",
        "references": [
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            "source": "security-advisories@github.com",
            "url": "https://github.com/envoyproxy/envoy/commit/26d5"
          },
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            "source": "security-advisories@github.com",
            "url": "https://github.com/envoyproxy/envoy/commit/50f7bfa48dccfee339822e9846b2b8053e07d325"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/envoyproxy/envoy/commit/b205d1f4982e14ce5693ba94ef84d37e7155e050"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/envoyproxy/envoy/commit/fcb663752c7055257f5dcc8b6ce6c7c905ebb1ff"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.36.10"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.37.6"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.38.4"
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            "source": "security-advisories@github.com",
            "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.39.1"
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            "source": "security-advisories@github.com",
            "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-m745-gh6x-349x"
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        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Received",
        "weaknesses": [
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            "description": [
              {
                "lang": "en",
                "value": "CWE-289"
              },
              {
                "lang": "en",
                "value": "CWE-436"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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