{
  "cveId": "CVE-2026-67235",
  "url": "https://patchblox.com/security/cve/CVE-2026-67235",
  "summary": "CVE-2026-67235 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: AMQP 0-9-1 body assembly never validates accumulated size",
  "description": "RabbitMQ is a messaging and streaming broker. Prior to versions 4.3.0, 4.2.6, 4.1.11, 4.0.20, and 3.13.15, The content-header BodySize (a uint64) was stored without validation against max_message_size. The size check ran only when assembly completed. By declaring body_size = 2^63-1 and then streaming fragments, a client ensured that check_msg_size never fired, so the accumulated body size went unbounded. A reader process accumulates memory until the memory alarm fires, degrading all publishers cluster-wide, or until the node runs out of memory. The memory alarm provides only partial mitigation, since it is reactive rather than preventive. AMQP 0-9-1 is the most widely used protocol, and any publisher can trigger this condition. Preconditions include Any authenticated AMQP 0-9-1 client with publish permission can exploit this.. This issue is fixed in versions 4.3.0, 4.2.6, 4.1.11, 4.0.20, and 3.13.15.",
  "published": "2026-09-23T14:17:00Z",
  "severity": "Moderate",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Allocation of Resources Without Limits or Throttling",
  "epss": 0.00302,
  "epssPercentile": 0.23096,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67235",
  "fixes": [
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Debian 14",
      "fixedVersion": "4.3.0-2",
      "fix": "DEBIAN-CVE-2026-67235",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-67235",
      "released": "2026-09-25T19:41:43Z"
    },
    {
      "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": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}