Medium severity · published Jul 10, 2026
CVE-2026-57217
RabbitMQ: Topic authorization can lead to cross-tenant routing-key bypass
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
RabbitMQ is a messaging and streaming broker. Prior to 3.13.15, 4.0.21, 4.1.11, and 4.2.6, RabbitMQ topic authorization can allow restricted topic writes and binds during metadata-store failures because topic-permission lookup errors from Khepri can collapse to undefined, which the internal backend treats as allow. This issue is fixed in versions 3.13.15, 4.0.21, 4.1.11, and 4.2.6.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% 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-2026-57217
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57217
Patch
https://github.com/rabbitmq/rabbitmq-server/commit/94f1d33a70fcfa09006649599e79fc92786a2d36
Patch
https://github.com/rabbitmq/rabbitmq-server/commit/ce1f682aa6b398820c5e3ce1ff7435184027c82c
Issue Tracking
https://github.com/rabbitmq/rabbitmq-server/pull/15941
Issue Tracking
https://github.com/rabbitmq/rabbitmq-server/pull/15943
Release Notes
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6
Exploit
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-gpvw-75h5-3wvx
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