Bug 2566802

Summary:	CVE-2026-67413 rabbitmq-server: rabbitmq-server: Denial of Service via unbounded regular expression evaluation in JMS topic exchange [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Mauro Matteo Cascella <mcascell>
Component:	rabbitmq-server	Assignee:	Peter Lemenkov <lemenkov>
Status:	ON_QA ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	lemenkov, rich
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["62c43c6f-656d-4373-85fc-8d132bc21fa6"]}
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2541526

Description Mauro Matteo Cascella 2026-11-04 10:22:28 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.23, 4.1.14, 4.2.9, and 4.3.3, the optional rabbitmq_jms_topic_exchange plugin's x-jms-topic exchange accepted a client-controlled rjms_erlang_selector binding expression whose LIKE evaluator expanded percent and underscore wildcards into overlapping PCRE fragments. It executed those fragments with raw re:run/3 without match or recursion limits, allowing an authenticated tenant that can bind and publish to consume broker scheduler CPU and deny service with pathological selectors. This issue is fixed in versions 4.0.23, 4.1.14, 4.2.9, and 4.3.3.

Comment 1 Peter Lemenkov 2026-11-04 15:43:35 UTC

This issue is fixed upstream in RabbitMQ 4.2.9 and 4.3.3. Fedora 45 and rawhide ship rabbitmq-server-4.3.7, and Fedora 44 ships rabbitmq-server-4.2.9, so both are already fixed.

The Fedora 43 (4.0.9) status is still being evaluated.

Comment 2 Fedora Update System 2026-11-04 18:14:57 UTC

FEDORA-2026-ea1afc0a7b (rabbitmq-server-4.0.9-7.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-ea1afc0a7b

Comment 3 Fedora Update System 2026-11-05 16:08:50 UTC

FEDORA-2026-ea1afc0a7b has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-ea1afc0a7b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-ea1afc0a7b

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.