MediumFix available

rabbitmq-server — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2026-67419

RabbitMQ is a messaging and streaming broker. Prior to 4.3.5, an authenticated user who can bind a queue to a topic exchange and publish to it can use consecutive # segments in a binding key to make both topic matchers revisit the same trie-node and routing-key-suffix states without memoization. The matcher materializes duplicate destinations before deduplication, causing combinatorial CPU work and memory pressure that can disrupt routing for all tenants. This vulnerability is fixed in 4.3.5.

Products: rabbitmq-server
Affected versions: 4.0.5-10, 4.0.5-11, 4.0.5-12, 4.0.5-13, 4.0.5-14, 4.0.5-6, 4.0.5-8, 4.0.5-9, 4.3.0-1, 4.3.0-2, 4.3.0-3, 4.3.2-1, 4.3.2-2, 4.3.2-3, 4.3.2-4, 4.3.2-5
Fixed versions: 4.3.6-1
CVEs: CVE-2026-67419
Confirmed fixed CVEs: Not specified
Updated in this feed: 1 Nov 2026, 01:22 UTC · Revision 1

Source evidence

DEBIAN-CVE-2026-67419

core-osv · Original source

Published 25 Sept 2026, 17:17 UTC

osv:DEBIAN-CVE-2026-67419

rabbitmq-server

Fixed versions: 4.3.6-1

Complete source record

{
  "id": "3513de1964875c82d8cec3f30d82a81f7670f41a8e984c013f2f247422c8803f",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-67419",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-67419",
    "summary": "RabbitMQ is a messaging and streaming broker. Prior to 4.3.5, an authenticated user who can bind a queue to a topic exchange and publish to it can use consecutive # segments in a binding key to make both topic matchers revisit the same trie-node and routing-key-suffix states without memoization. The matcher materializes duplicate destinations before deduplication, causing combinatorial CPU work and memory pressure that can disrupt routing for all tenants. This vulnerability is fixed in 4.3.5.",
    "evidence": "osv:DEBIAN-CVE-2026-67419",
    "products": [
      {
        "name": {
          "value": "rabbitmq-server",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.3.6-1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "4.0.5-10",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.0.5-11",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.0.5-12",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.0.5-13",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.0.5-14",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.0.5-6",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.0.5-8",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.0.5-9",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.3.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.3.0-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.3.0-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.3.2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.3.2-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.3.2-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.3.2-4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.3.2-5",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2026-67419",
      "aliases": [
        "DEBIAN-CVE-2026-67419"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.3.6-1"
                }
              ]
            }
          ],
          "package": {
            "name": "rabbitmq-server",
            "purl": "pkg:deb/debian/rabbitmq-server?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "4.0.5-10",
            "4.0.5-11",
            "4.0.5-12",
            "4.0.5-13",
            "4.0.5-14",
            "4.0.5-6",
            "4.0.5-8",
            "4.0.5-9",
            "4.3.0-1",
            "4.3.0-2",
            "4.3.0-3",
            "4.3.2-1",
            "4.3.2-2",
            "4.3.2-3",
            "4.3.2-4",
            "4.3.2-5"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-67419.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-23T18:04:40.577792461Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-67419"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-67419"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-67419",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 423627,
  "published_at": "2026-09-25T17:17:13.83+00:00"
}