Bug 2507940

Summary:	CVE-2026-57221 rabbitmq-server: RabbitMQ: Information disclosure via authorization bypass in AMQP 0-9-1 operations [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Marian Rehak <mrehak>
Component:	rabbitmq-server	Assignee:	Peter Lemenkov <lemenkov>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	lemenkov, rjones
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["bc66d88d-7a2c-4c94-bb48-ca50852fa14a"]}
Fixed In Version:	rabbitmq-server-4.0.9-5.fc43	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-08 01:27:25 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2499206

Description Marian Rehak 2026-07-28 09:43:42 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. Prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6, RabbitMQ does not perform authorization checks on passive queue.declare and exchange.declare AMQP 0-9-1 operations, allowing any authenticated user who can connect to a virtual host to enumerate queue and exchange names and read queue message and consumer counts. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.

Comment 1 Peter Lemenkov 2026-07-30 15:06:06 UTC

Fixed upstream in RabbitMQ 4.2.6 (commit dc3d1aa4f5c3331a425ee599b45be9423a2e83fc).

Fedora status:
- rawhide (4.3.3) and f44 (4.2.9) already ship >= 4.2.6 and contain the fix.
- f43 (4.0.9): the upstream 4.0.x line is EOL with no fixed 4.0.x release, so the fix has been backported onto 4.0.9. Build in progress.

Comment 2 Fedora Update System 2026-07-30 15:25:38 UTC

FEDORA-2026-548235ea3b (rabbitmq-server-4.0.9-5.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-548235ea3b

Comment 3 Fedora Update System 2026-07-31 01:44:37 UTC

FEDORA-2026-548235ea3b 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-2026-548235ea3b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-548235ea3b

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

Comment 4 Fedora Update System 2026-08-08 01:27:25 UTC

FEDORA-2026-548235ea3b (rabbitmq-server-4.0.9-5.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.