MediumFix available

RabbitMQ: Atom exhaustion: to_atom on global-parameter :name

Type: advisorySources: OSV

RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.22 and 4.1.14 and 4.2.7 and 4.3.1, Atom exhaustion: toatom on global-parameter :name. resourceexists/2 (and the PUT/DELETE handlers) call rabbitdatacoercion:toatom/1 on the :name URL path segment. toatom/1 uses binarytoatom/2 (unsafe). The endpoint requires policymaker (not management, but below A user with the policymaker tag can crash the node by exhausting the atom table via repeated requests to /api/global-parameters/:name with unique :name Management plugin enabled policymaker tag ~1M HTTP. This issue is fixed in versions 4.0.22 and 4.1.14 and 4.2.7 and 4.3.1.

Products: rabbitmq
Affected versions: Not specified
Fixed versions: 4.0.22, 4.1.14, 4.2.7, 4.3.1
CVEs: CVE-2026-67227
Confirmed fixed CVEs: Not specified
Updated in this feed: 31 Oct 2026, 14:09 UTC · Revision 1

Source evidence

RabbitMQ: Atom exhaustion: to_atom on global-parameter :name

core-osv · Original source

Published 1 Oct 2026, 09:33 UTC

osv:BIT-rabbitmq-2026-67227

rabbitmq

Fixed versions: 4.0.22, 4.1.14, 4.2.7, 4.3.1

Complete source record

{
  "id": "969aa0192370d54346f91d4bc97fc4b81f91382a20d40d89b1c4efcae27399be",
  "url": "https://osv.dev/vulnerability/BIT-rabbitmq-2026-67227",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RabbitMQ: Atom exhaustion: to_atom on global-parameter :name",
    "summary": "RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.22 and 4.1.14 and 4.2.7 and 4.3.1, Atom exhaustion: toatom on global-parameter :name. resourceexists/2 (and the PUT/DELETE handlers) call rabbitdatacoercion:toatom/1 on the :name URL path segment. toatom/1 uses binarytoatom/2 (unsafe). The endpoint requires policymaker (not management, but below A user with the policymaker tag can crash the node by exhausting the atom table via repeated requests to /api/global-parameters/:name with unique :name Management plugin enabled policymaker tag ~1M HTTP. This issue is fixed in versions 4.0.22 and 4.1.14 and 4.2.7 and 4.3.1.",
    "evidence": "osv:BIT-rabbitmq-2026-67227",
    "products": [
      {
        "name": {
          "value": "rabbitmq",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.0.22",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "4.1.14",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "4.2.7",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "4.3.1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "BIT-rabbitmq-2026-67227",
      "aliases": [
        "BIT-rabbitmq-2026-67227",
        "CVE-2026-67227",
        "GHSA-q7x8-97rh-cr24"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "4.0.0"
                },
                {
                  "fixed": "4.0.22"
                },
                {
                  "introduced": "4.1.0"
                },
                {
                  "fixed": "4.1.14"
                },
                {
                  "introduced": "4.2.0"
                },
                {
                  "fixed": "4.2.7"
                },
                {
                  "introduced": "4.3.0"
                },
                {
                  "fixed": "4.3.1"
                }
              ]
            }
          ],
          "package": {
            "name": "rabbitmq",
            "purl": "pkg:bitnami/rabbitmq",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V4",
              "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/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-2026-67227.json"
          }
        }
      ],
      "modified": "2026-10-21T12:00:37.686883152Z",
      "provider": "osv",
      "references": [
        "https://github.com/rabbitmq/rabbitmq-server/commit/8fbe6d8112427e85fb9a9206b3eb6e9a3ddd3e39",
        "https://github.com/rabbitmq/rabbitmq-server/commit/fc591e7ee27a29657ca960930acefd3e4217e007",
        "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7",
        "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1",
        "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-q7x8-97rh-cr24",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-67227"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:vmware:rabbitmq:*:*:*:*:*:*:*:*"
        ],
        "severity": "Medium"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-67227",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 393015,
  "published_at": "2026-10-01T09:33:18.148+00:00"
}