{
  "cveId": "CVE-2026-67407",
  "url": "https://patchblox.com/security/cve/CVE-2026-67407",
  "summary": "CVE-2026-67407 is fixed in rabbitmq-server on 1 platform by DEBIAN-CVE-2026-67407 (version 4.3.6-1), released October 10, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "RabbitMQ: Incomplete fix for CVE-2026-44838: \u0060escape_regex_char/1\u0060 does not escape \u0060-\u0060, leaving room for an MQTT topic permission bypass",
  "description": "RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23, Incomplete fix for CVE-2026-44838: escaperegexchar/1 does not escape -, leaving room for an MQTT topic permission bypass. the CVE-2026-44838 fix made expandtopicpermission/2 escape regex metacharacters in expanded topic-permission variables (escaperegex(V)), but escaperegexchar/1 escapes \\ ^ $ . | ? \u002B ( ) [ ] { } and omits -. When a topic permission template places {clientid} inside a [...] character class A low-privileged authenticated MQTT user controlling its clientid can broaden topic authorization (read and write) when templates embed {clientid} in a [...] This issue is fixed in versions 4.3.3 and 4.2.9 and 4.1.14 and 4.0.23.",
  "published": "2026-09-25T17:17:12Z",
  "severity": "Moderate",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
  "cwe": "Missing Authorization",
  "epss": 0.00263,
  "epssPercentile": 0.18211,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67407",
  "fixes": [
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Debian 14",
      "fixedVersion": "4.3.6-1",
      "fix": "DEBIAN-CVE-2026-67407",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-67407",
      "released": "2026-10-10T22:48:57Z"
    }
  ],
  "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"
  }
}