{"id":28262,"date":"2026-09-24T08:31:38","date_gmt":"2026-09-24T00:31:38","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-67240"},"modified":"2026-09-24T08:31:38","modified_gmt":"2026-09-24T00:31:38","slug":"cve-2026-67240","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-67240","title":{"rendered":"CVE-2026-67240 &#8211; RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, pattern_t"},"content":{"rendered":"<p>RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, pattern_to_regex maps % -&gt; .*? and _ -&gt; ., then compiles ^&#8230;$ with only [unicode]; re:run is called with only [{capture, none}] &#8211; no explicit match_limit. A pattern like %_%_&#8230;_%X becomes ^.*?..*?&#8230;..*?.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&#8217;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 &#8211; 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.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, pattern_to_regex maps % -&gt; .*? and _ -&gt; ., then compiles ^&#8230;$ with only [unicode]; re:run is called with only [{captur<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28262","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28262","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=28262"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28262"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}