HighFix available

Envoy ext_authz: request `:path` pseudoheader dereferenced w/o null check

Type: advisorySources: OSV

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's ext_authz filter assumes that a request contains a :path pseudoheader when applying query_parameters_to_set or query_parameters_to_remove from an authorization response. A path-less CONNECT request makes request_headers_->Path() return null, and Filter::onComplete dereferences that pointer while parsing the query string. An unauthenticated downstream client can crash the Envoy process when the filter and authorization response use query-parameter mutation. The relevant scope boundary is that the deployment must accept path-less CONNECT and configure ext_authz query-parameter mutation. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

Products: envoy
Affected versions: Not specified
Fixed versions: 1.36.10, 1.37.6, 1.38.4, 1.39.1
CVEs: CVE-2026-73547
Confirmed fixed CVEs: Not specified
Updated in this feed: 28 Oct 2026, 04:18 UTC · Revision 1

Source evidence

Envoy ext_authz: request `:path` pseudoheader dereferenced w/o null check

core-osv · Original source

Published 29 Sept 2026, 08:43 UTC

osv:BIT-envoy-2026-73547

envoy

Fixed versions: 1.36.10, 1.37.6, 1.38.4, 1.39.1

Complete source record

{
  "id": "77d689d7026a5dc8452ac62af365d8ec247f4eb03646b294a4b552cd737358dc",
  "url": "https://osv.dev/vulnerability/BIT-envoy-2026-73547",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Envoy ext_authz: request `:path` pseudoheader dereferenced w/o null check",
    "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's ext_authz filter assumes that a request contains a :path pseudoheader when applying query_parameters_to_set or query_parameters_to_remove from an authorization response. A path-less CONNECT request makes request_headers_->Path() return null, and Filter::onComplete dereferences that pointer while parsing the query string. An unauthenticated downstream client can crash the Envoy process when the filter and authorization response use query-parameter mutation. The relevant scope boundary is that the deployment must accept path-less CONNECT and configure ext_authz query-parameter mutation. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.",
    "evidence": "osv:BIT-envoy-2026-73547",
    "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-2026-73547",
      "aliases": [
        "BIT-envoy-2026-73547",
        "CVE-2026-73547",
        "GHSA-87ph-jqwm-pg6r"
      ],
      "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:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/envoy/BIT-envoy-2026-73547.json"
          }
        }
      ],
      "modified": "2026-10-07T14:30:09.542416649Z",
      "provider": "osv",
      "references": [
        "https://github.com/envoyproxy/envoy/commit/064af2e61d0d1c421490d9e3e6e643c5d117ffe4",
        "https://github.com/envoyproxy/envoy/commit/5f3b8e9b2b8a787a63202d35bb38820f3e9271fe",
        "https://github.com/envoyproxy/envoy/commit/838f8ffd9d7b5217682a22ee33470d4c7afb7e98",
        "https://github.com/envoyproxy/envoy/commit/c3170d7c747e51bb8254378ea89afc03d3e71929",
        "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-87ph-jqwm-pg6r",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-73547"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*"
        ],
        "severity": "High"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-73547",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 95103,
  "published_at": "2026-09-29T08:43:10.685+00:00"
}