{"id":"CVE-2026-67238","summary":"RabbitMQ: Atom-table exhaustion via reply-to queue name decoding","details":"RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, rabbit_pid_codec:decompose_from_binary/1 parses a caller-supplied ETF-encoded binary and calls binary_to_atom(Node, utf8) on the node-name field. It is reached from rabbit_volatile_queue:pid_from_name/2, which is invoked for any queue name / routing key beginning amq.rabbitmq.reply-to.. The CandidateNodes membership check happens after the atom is created, and the surrounding try/catch cannot reclaim atoms (they are never GC'd). binary_to_existing_atom is not used. Any authenticated AMQP client can crash the entire Erlang VM (all vhosts, all connections) with ~1M cheap requests. Preconditions include Authenticated AMQP 0-9-1 connection to any vhost No per-connection rate limit low enough to make ~1M operations infeasible. This issue is fixed in versions 4.2.7 and 4.3.1.","aliases":["GHSA-x96j-244m-mrr2"],"modified":"2026-09-25T03:48:37.996013041Z","published":"2026-09-23T19:58:35.019Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67238.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-400"]},"references":[{"type":"WEB","url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7"},{"type":"WEB","url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67238.json"},{"type":"ADVISORY","url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-x96j-244m-mrr2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67238"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rabbitmq/rabbitmq-server","events":[{"introduced":"95c501fbad76c66156346cf364d158d6e30aa4d9"},{"introduced":"1929eeadf9b2bac12c5434fb56884ef27370580e"},{"fixed":"b15fd2a3e5465cb6ed403d5a774ef61b1a391b89"},{"fixed":"49decca35e59d2cb774e5abd76412cee721308a5"}],"database_specific":{"extracted_events":[{"introduced":"4.2.0"},{"fixed":"4.2.7"},{"introduced":"4.3.0"},{"fixed":"4.3.1"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v4.2.6","v4.3.0","v4.2.5","v4.2.4","v4.2.3","v4.2.2","v4.2.1","v4.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67238.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}