Medium severity · published Jul 10, 2026
CVE-2026-57221
RabbitMQ: Passive queue/exchange declaration bypasses authorization checks, leaking queue metadata to unprivileged users
5.0
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RA
rabbitmq-server · rabbitmq
>= 4.2.0, < 4.2.6; >= 4.1.0, < 4.1.11; >= 4.0.0, < 4.0.21; >= 3.13.0, < 3.13.15 · source: vendor
RS
Rabbitmq Server · Broadcom
3.13.0 before 4.2.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57221
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57221
Patch
https://github.com/rabbitmq/rabbitmq-server/commit/709a14e49e06c138a8cd672c9809ca34a2767962
Patch
https://github.com/rabbitmq/rabbitmq-server/commit/dc3d1aa4f5c3331a425ee599b45be9423a2e83fc
Issue Tracking
https://github.com/rabbitmq/rabbitmq-server/pull/16085
Issue Tracking
https://github.com/rabbitmq/rabbitmq-server/pull/16090
Release Notes
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6
Exploit
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-9q2j-2hq8-22r2
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