Envoy: RBAC Authorization Bypass via Path Parameters

{
  "id": "baf61aa9c4a5e005d55e6e3330049f3f72918539f787105dd51e1726a7321875",
  "url": "https://osv.dev/vulnerability/BIT-envoy-2026-73553",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Envoy: RBAC Authorization Bypass via Path Parameters",
    "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, When ignore_path_parameters_in_path_matching is enabled, Envoy's router strips the semicolon suffix before matching but the RBAC url_path matcher evaluates the raw path. A downstream request such as /admin;x can therefore miss a DENY rule for /admin while the router still selects the protected /admin backend. The inconsistent canonicalization allows an unauthenticated client to bypass path-based authorization. The relevant scope boundary is that the route option and a path-based RBAC rule must both be present, and the protected route must match after stripping. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.",
    "evidence": "osv:BIT-envoy-2026-73553",
    "products": [
      {
        "name": {
          "value": "envoy",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.36.10",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "1.37.6",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "1.38.4",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "1.39.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "BIT-envoy-2026-73553",
      "aliases": [
        "BIT-envoy-2026-73553",
        "CVE-2026-73553",
        "GHSA-77x5-xqjg-hprq"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.36.10"
                },
                {
                  "introduced": "1.37.0"
                },
                {
                  "fixed": "1.37.6"
                },
                {
                  "introduced": "1.38.0"
                },
                {
                  "fixed": "1.38.4"
                },
                {
                  "introduced": "1.39.0"
                },
                {
                  "fixed": "1.39.1"
                }
              ]
            }
          ],
          "package": {
            "name": "envoy",
            "purl": "pkg:bitnami/envoy",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V3",
              "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/envoy/BIT-envoy-2026-73553.json"
          }
        }
      ],
      "modified": "2026-10-06T15:15:05.331530699Z",
      "provider": "osv",
      "references": [
        "https://github.com/envoyproxy/envoy/commit/0be4a0302ea94a894e470817c2edfbd5ed90d273",
        "https://github.com/envoyproxy/envoy/commit/6a703a375a20e3bf98140ee5f5522c614adee7b6",
        "https://github.com/envoyproxy/envoy/commit/b6ec9b66cc33a415e2fa81a6fa8363cac4772dd1",
        "https://github.com/envoyproxy/envoy/commit/e6d5fe885409ebb335ed3934a167f0bcfea471f2",
        "https://github.com/envoyproxy/envoy/releases/tag/v1.36.10",
        "https://github.com/envoyproxy/envoy/releases/tag/v1.37.6",
        "https://github.com/envoyproxy/envoy/releases/tag/v1.38.4",
        "https://github.com/envoyproxy/envoy/releases/tag/v1.39.1",
        "https://github.com/envoyproxy/envoy/security/advisories/GHSA-77x5-xqjg-hprq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-73553"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*"
        ],
        "severity": "High"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-73553",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 89126,
  "published_at": "2026-09-29T08:43:19.227+00:00"
}