Inefficient regular expression complexity in RabbitMQ Server - #VU139290
Published: July 24, 2026
Vulnerability identifier: #VU139290
CSH Severity: Low
CVSS v4 BT: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: N/A
CWE-ID: CWE-1333
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to inefficient regular expression complexity in the rabbitmq_jms_topic_exchange plugin when processing client-supplied JMS selectors during message routing. A remote user can bind an x-jms-topic exchange with an ambiguous LIKE pattern and repeatedly publish matching-shaped header values to cause a denial of service.
The issue affects the optional first-party JMS Topic Exchange plugin and delays publisher confirms while consuming broker CPU on the routing path.
Affected software
RabbitMQ Server
Remediation
Install security update from vendor's website.
RabbitMQ Server - addressed in versions 4.0.23, 4.1.14, 4.2.9, 4.3.3