{"id":"CVE-2026-67229","title":"RabbitMQ is a messaging and streaming broker","summary":"RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, add_vhost/2 calls rabbit_data_coercion:atomize_keys/1 (the unsafe variant using binary_to_atom) on the vhost metadata map. The 20 …","severity":"medium","cvss":6.9,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","cwe":["CWE-400","CWE-770"],"vendor":"rabbitmq","product":"rabbitmq-server","affected":["rabbitmq-server >= 3.13.0, < 3.13.15","rabbitmq-server >= 4.0.0, < 4.0.20","rabbitmq-server >= 4.1.0, < 4.1.11","rabbitmq-server >= 4.2.0, < 4.2.6"],"published":"2026-09-23","updated":"2026-09-23","sourceUpdated":"2026-09-23T21:17:00.800","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-67229","references":[{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.0","label":"security-advisories@github.com"},{"url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-ggrw-qm45-hwpv","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67229.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-67229"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539770"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67229"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67229"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"cvssSource":"cna","ingestedAt":"2026-09-23T21:33:13.530Z","scores":{"cna":6.9,"vendor":4.9},"slug":"CVE-2026-67229","body":"## Overview\n\nRabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, add_vhost/2 calls rabbit_data_coercion:atomize_keys/1 (the unsafe variant using binary_to_atom) on the vhost metadata map. The 20 MB management body limit fits ~1M+ short keys. Admin-only. An administrator importing a crafted definitions file can crash the node in a single request: a vhosts entry with ~1M unique metadata keys exhausts the atom table during import. Preconditions include administrator tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67229.json)","depth":"sunlit","depthScore":38,"depthScoreParts":{"impact":38,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}