{"schema_version":"2","view":"grouped","data":[{"id":60420,"cve_ids":["CVE-2026-67240"],"payload":{"kind":"advisory","title":"RabbitMQ: ReDoS via AMQP 1.0 SQL filter LIKE wildcard","summary":"RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, pattern_to_regex maps % -> .*? and _ -> ., then compiles ^...$ with only [unicode]; re:run is called with only [{capture, none}] - no explicit match_limit. A pattern like %_%_..._%X becomes ^.*?..*?.....*?.X$ with overlapping lazy quantifiers. The whole-expression cap is ?MAX_EXPRESSION_LENGTH=4096 chars / ?MAX_TOKENS=200; a LIKE string literal is one token, so ~2000 %_ pairs fit. SQL filters are accepted unconditionally at rabbit_amqp_session.erl:3264 (no feature flag). Evaluated per-message at rabbit_stream_queue.erl:1439. OTP's default 10M match_limit caps each match at ~100-200 ms (not seconds), and the re NIF yields to the scheduler. An authenticated AMQP 1.0 consumer with read+write on a stream queue can cause ~100-200 ms of CPU per delivered message via a crafted LIKE filter, multiplied across thousands of messages and parallel sessions - a substantial backtracking-driven CPU amplification. Preconditions include AMQP 1.0 with stream queues in use Attacker can attach a receiver with a filter (read permission) and publish messages with long property values (write permission). 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Prior to versions 4.2.7 and 4.3.1, pattern_to_regex maps % -> .*? and _ -> ., then compiles ^...$ with only [unicode]; re:run is called with only [{capture, none}] - no explicit match_limit. A pattern like %_%_..._%X becomes ^.*?..*?.....*?.X$ with overlapping lazy quantifiers. The whole-expression cap is ?MAX_EXPRESSION_LENGTH=4096 chars / ?MAX_TOKENS=200; a LIKE string literal is one token, so ~2000 %_ pairs fit. SQL filters are accepted unconditionally at rabbit_amqp_session.erl:3264 (no feature flag). Evaluated per-message at rabbit_stream_queue.erl:1439. OTP's default 10M match_limit caps each match at ~100-200 ms (not seconds), and the re NIF yields to the scheduler. An authenticated AMQP 1.0 consumer with read+write on a stream queue can cause ~100-200 ms of CPU per delivered message via a crafted LIKE filter, multiplied across thousands of messages and parallel sessions - a substantial backtracking-driven CPU amplification. Preconditions include AMQP 1.0 with stream queues in use Attacker can attach a receiver with a filter (read permission) and publish messages with long property values (write permission). This issue is fixed in versions 4.2.7 and 4.3.1.","evidence":"cve:CVE-2026-67240","products":[{"name":{"value":"rabbitmq-server","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"low","structured":{"id":"CVE-2026-67240","aliases":["CVE-2026-67240"],"metrics":[{"cvssV4_0":{"version":"4.0","baseScore":2.3,"attackVector":"NETWORK","baseSeverity":"LOW","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","userInteraction":"NONE","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"LOW","subIntegrityImpact":"NONE","vulnIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","vulnConfidentialityImpact":"NONE"}}],"affected":[{"vendor":"rabbitmq","product":"rabbitmq-server","versions":[{"status":"affected","version":">= 4.2.0, < 4.2.7"},{"status":"affected","version":">= 4.3.0, < 4.3.1"}]}],"modified":"2026-09-24T14:24:51.504Z","provider":"cve","references":["https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-59c5-553c-57m2","https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7","https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-67240","role":"CISA Coordinator","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-24T14:24:20.497820Z"}}}],"references":[{"url":"https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-59c5-553c-57m2","tags":["exploit"]}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-24T14:24:51.504Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-23T20:19:22.703Z"}}},"related_cves":[{"value":"CVE-2026-67240","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"},"group_id":"advisory:d79e895d-72e1-4707-b9cb-90ad71810e29","priority":{"reasons":[],"severity":"low","linked_cves":[{"cve":"CVE-2026-67240","metrics":[],"products":[{"name":{"value":"rabbitmq","evidence":"/affected/0/package/name"},"prerequisites":[],"fixed_versions":[{"value":"4.2.7","evidence":"/affected/0/ranges"},{"value":"4.3.1","evidence":"/affected/0/ranges"}],"affected_versions":[]}],"severity":"low","source_id":"core-osv","source_url":"https://osv.dev/vulnerability/BIT-rabbitmq-2026-67240","relationship":"advisory","known_exploited":false,"relationship_evidence":"/cveMetadata/cveId"}],"fix_available":false,"known_exploited":false,"publisher_severity":"low"},"revision":2,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-67240","advisory_id":"d79e895d-72e1-4707-b9cb-90ad71810e29","event_types":["advisory"],"published_at":"2026-10-25T18:33:40.191825+00:00","technologies":["core-cve","rabbitmq-server"],"context_update":true,"extraction_method":"structured","source_published_at":"2026-09-23T20:19:22.703+00:00","detail_url":"/events/59626"},"members":[{"id":59626,"cve_ids":["CVE-2026-67240"],"payload":{"kind":"advisory","title":"RabbitMQ: ReDoS via AMQP 1.0 SQL filter LIKE wildcard","summary":"RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, pattern_to_regex maps % -> .*? and _ -> ., then compiles ^...$ with only [unicode]; re:run is called with only [{capture, none}] - no explicit match_limit. A pattern like %_%_..._%X becomes ^.*?..*?.....*?.X$ with overlapping lazy quantifiers. The whole-expression cap is ?MAX_EXPRESSION_LENGTH=4096 chars / ?MAX_TOKENS=200; a LIKE string literal is one token, so ~2000 %_ pairs fit. SQL filters are accepted unconditionally at rabbit_amqp_session.erl:3264 (no feature flag). Evaluated per-message at rabbit_stream_queue.erl:1439. OTP's default 10M match_limit caps each match at ~100-200 ms (not seconds), and the re NIF yields to the scheduler. An authenticated AMQP 1.0 consumer with read+write on a stream queue can cause ~100-200 ms of CPU per delivered message via a crafted LIKE filter, multiplied across thousands of messages and parallel sessions - a substantial backtracking-driven CPU amplification. Preconditions include AMQP 1.0 with stream queues in use Attacker can attach a receiver with a filter (read permission) and publish messages with long property values (write permission). 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