{
  "cveId": "CVE-2026-66071",
  "url": "https://patchblox.com/security/cve/CVE-2026-66071",
  "summary": "CVE-2026-66071 is fixed in rabbitmq-server on 1 platform by DEBIAN-CVE-2026-66071 (version 4.3.2-1), released September 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "RabbitMQ: Atom exhaustion: OAuth2 JWT tag: scope values",
  "description": "RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15 and 4.0.22 and 4.1.11 and 4.2.6 and 4.3.1, Atom exhaustion: OAuth2 JWT tag: scope values. extractscopes/1 parses scopes of the form .tag: and calls rabbitdatacoercion:toatom() to convert to a tag atom. The token signature is verified first, so the attacker cannot forge scopes , but in IdP configurations where scope content is user-influenced, each login with a novel tag value leaks one In deployments where users can influence the scopes included in their IdP-issued JWT rabbitmqauthbackendoauth2 enabled IdP permits attacker-influenced scope values in signed tokens. This issue is fixed in versions 3.13.15 and 4.0.22 and 4.1.11 and 4.2.6 and 4.3.1.",
  "published": "2026-09-25T17:17:09Z",
  "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": "Uncontrolled Resource Consumption",
  "epss": 0.00542,
  "epssPercentile": 0.45813,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66071",
  "fixes": [
    {
      "platform": "linux",
      "product": "rabbitmq-server",
      "release": "Debian 14",
      "fixedVersion": "4.3.2-1",
      "fix": "DEBIAN-CVE-2026-66071",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-66071",
      "released": "2026-09-26T19:52:05Z"
    }
  ],
  "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"
  }
}