RabbitMQ: JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Authentication DoS

{
  "id": "97447c71a991b1031780e07ce083e0238503f5968f858df9580f5ba9be726218",
  "url": "https://osv.dev/vulnerability/BIT-rabbitmq-2026-67409",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RabbitMQ: JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Authentication DoS",
    "summary": "RabbitMQ is a messaging and streaming broker. From 3.13.0 until 4.3.3, 4.2.9, 4.1.14, 4.0.23, and 3.13.18, JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Authentication DoS (CWE-252). the JWKS key fetching mechanism in uaajwt.erl does not validate the HTTP response status code when downloading signing keys from the OAuth2 provider's JWKS endpoint. Non-200 responses (including 4xx and 5xx errors) are processed identically to successful responses. When the JWKS endpoint returns an error response with a valid-JSON body that lacks a keys field, all previously cached signing keys are destroyed, causing a persistent authentication denial of Files: deps/rabbitmqauthbackendoauth2/src/uaajwt.erl, lines 50-63 deps/rabbitmqauthbackendoauth2/src/uaajwks.erl, lines 5-7 deps/rabbitmqauthbackendoauth2/src/rabbitoauth2provider.erl, lines 98-107 Bug 1: HTTP status code ignored (uaajwt.erl:50-63): The Erlang httpc module returns {ok, {{HttpVersion, StatusCode, ReasonPhrase}, Headers, Body}}. The pattern {ok, {, , JwksBody}} matches ANY successful HTTP transaction Persistent authentication DoS: Once keys are destroyed, ALL OAuth2/JWT authentication fails for all users until a new successful JWKS refresh occurs Amplification: A single attacker can deny access to all legitimate OAuth2 users across the entire RabbitMQ. This issue is fixed in versions 4.3.3, 4.2.9, 4.1.14, 4.0.23, and 3.13.18.",
    "evidence": "osv:BIT-rabbitmq-2026-67409",
    "products": [
      {
        "name": {
          "value": "rabbitmq",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.13.18",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "4.0.23",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "4.1.14",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "4.2.9",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "4.3.3",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "BIT-rabbitmq-2026-67409",
      "aliases": [
        "BIT-rabbitmq-2026-67409",
        "CVE-2026-67409",
        "GHSA-qw3h-qqm9-jrw8"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "3.13.0"
                },
                {
                  "fixed": "3.13.18"
                },
                {
                  "introduced": "4.0.0"
                },
                {
                  "fixed": "4.0.23"
                },
                {
                  "introduced": "4.1.0"
                },
                {
                  "fixed": "4.1.14"
                },
                {
                  "introduced": "4.2.0"
                },
                {
                  "fixed": "4.2.9"
                },
                {
                  "introduced": "4.3.0"
                },
                {
                  "fixed": "4.3.3"
                }
              ]
            }
          ],
          "package": {
            "name": "rabbitmq",
            "purl": "pkg:bitnami/rabbitmq",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V4",
              "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/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"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/rabbitmq/BIT-rabbitmq-2026-67409.json"
          }
        }
      ],
      "modified": "2026-10-09T12:00:10.933131895Z",
      "provider": "osv",
      "references": [
        "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9",
        "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3",
        "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-qw3h-qqm9-jrw8",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-67409"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:vmware:rabbitmq:*:*:*:*:*:*:*:*"
        ],
        "severity": "High"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-67409",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 120679,
  "published_at": "2026-10-01T09:33:49.456+00:00"
}