{"schemaVersion":3,"id":"CVE-2026-67238","aliases":["UBUNTU-CVE-2026-67238","DEBIAN-CVE-2026-67238"],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-09-23T19:58:35.019Z","modified":"2026-09-24T15:05:11.870Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.1,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":7.1,"severity":"high","vector":"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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":7.1,"severity":"high","vector":"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","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · 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4.3.1","eol":null,"hubHref":"/vendor/rabbitmq/rabbitmq-server"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-x96j-244m-mrr2","label":"github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-x96j-244m-mrr2","hostname":"github.com","tags":["X Refsource CONFIRM","REPORT"]},{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7","label":"github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7","hostname":"github.com","tags":["X Refsource MISC","REPORT"]},{"url":"https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1","label":"github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1","hostname":"github.com","tags":["X Refsource 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