CVE-2026-67240RabbitMQ: ReDoS via AMQP 1.0 SQL filter LIKE wildcard

Official description

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). This issue is fixed in versions 4.2.7 and 4.3.1.

Affected packages & fixed versions

Affected products (as reported)

References

• https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-59c5-553c-57m2 x_refsource_CONFIRM
• https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7 x_refsource_MISC
• https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1 x_refsource_MISC