{
  "cveId": "CVE-2026-67409",
  "url": "https://patchblox.com/security/cve/CVE-2026-67409",
  "summary": "CVE-2026-67409 is fixed in rabbitmq-server on 1 platform, first by rabbitmq-server 4.0.5-10ubuntu5.2, released September 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "RabbitMQ: JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Authentication DoS",
  "description": "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\u0027s 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.",
  "published": "2026-09-25T10:17:00Z",
  "severity": "Important",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Unchecked Return Value",
  "epss": 0.00418,
  "epssPercentile": 0.36351,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67409",
  "fixes": [
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Debian 14",
      "fixedVersion": "4.3.6-1",
      "fix": "DEBIAN-CVE-2026-67409",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-67409",
      "released": "2026-10-10T22:48:57Z"
    },
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "3.6.10-1ubuntu0.5\u002Besm1",
      "fix": "rabbitmq-server 3.6.10-1ubuntu0.5\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-rabbitmq-server-3.6.10-1ubuntu0.5-esm1",
      "released": "2026-10-19T16:27:57Z"
    },
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "3.8.3-0ubuntu0.3\u002Besm2",
      "fix": "rabbitmq-server 3.8.3-0ubuntu0.3\u002Besm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-rabbitmq-server-3.8.3-0ubuntu0.3-esm2",
      "released": "2026-10-19T16:28:02Z"
    },
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "3.9.27-0ubuntu0.6",
      "fix": "rabbitmq-server 3.9.27-0ubuntu0.6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-rabbitmq-server-3.9.27-0ubuntu0.6",
      "released": "2026-10-19T16:28:05Z"
    },
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "3.12.1-1ubuntu1.7",
      "fix": "rabbitmq-server 3.12.1-1ubuntu1.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-rabbitmq-server-3.12.1-1ubuntu1.7",
      "released": "2026-10-19T16:28:08Z"
    },
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "4.0.5-10ubuntu5.2",
      "fix": "rabbitmq-server 4.0.5-10ubuntu5.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-rabbitmq-server-4.0.5-10ubuntu5.2",
      "released": "2026-09-25T10:17:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}