CVE catalog

CVE-2026-66071

RabbitMQ is a messaging and streaming broker. From…

[CVE catalog]

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.

Severity
Medium · CVSS 6CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.54% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence
Original provider fields
{
  "package_releases": [
    {
      "name": "rabbitmq-server",
      "status": "fixed",
      "release": "sid",
      "version": "4.3.6-1"
    },
    {
      "name": "rabbitmq-server",
      "status": "fixed",
      "release": "forky",
      "version": "4.3.6-1"
    },
    {
      "name": "rabbitmq-server",
      "status": "vulnerable",
      "release": "trixie",
      "version": "4.0.5-6+deb13u2"
    },
    {
      "name": "rabbitmq-server",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "3.10.8-1.1+deb12u1"
    },
    {
      "name": "rabbitmq-server",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "3.10.8-1.1+deb12u1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "rabbitmq-server",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "4.3.2-1"
    },
    {
      "bug": null,
      "name": "rabbitmq-server",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "4.3.2-1"
    },
    {
      "bug": null,
      "name": "rabbitmq-server",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "rabbitmq-server",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "rabbitmq_server",
      "ranges": [
        {
          "fixed": "4.3.1",
          "introduced": "4.3.0",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "4.3.1",
      "provider_record_id": "NVD-CVE-2026-66071"
    },
    {
      "name": "rabbitmq",
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "3.13.0"
            },
            {
              "fixed": "3.13.15"
            },
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.0.22"
            },
            {
              "introduced": "4.1.0"
            },
            {
              "fixed": "4.1.11"
            },
            {
              "introduced": "4.2.0"
            },
            {
              "fixed": "4.2.6"
            },
            {
              "introduced": "4.3.0"
            },
            {
              "fixed": "4.3.1"
            }
          ]
        }
      ],
      "versions": [],
      "ecosystem": "Bitnami",
      "fixed_version": "3.13.15",
      "provider_record_id": "BIT-RABBITMQ-2026-66071"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [rabbitmq-server]Unknown
    Details (4)

    • 3.10.8-1.1+deb12u1 · all · bookworm

      Affected

      nvd · rabbitmq-server · debian · bookworm

    • 3.10.8-1.1+deb12u1 · all · bookworm

      Affected

      nvd · rabbitmq-server · debian · bookworm

    • 3.10.8-1.1+deb12u1 · all · bookworm-security

      Affected

      nvd · rabbitmq-server · debian · bookworm

    • 3.10.8-1.1+deb12u1 · all · bookworm-security

      Affected

      nvd · rabbitmq-server · debian · bookworm

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]