Inefficient regular expression complexity in RabbitMQ Server - #VU137231
Published: July 9, 2026
Vulnerability identifier: #VU137231
CSH Severity: Low
CVSS v4 BT: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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 AMQP 1.0 SQL filter LIKE handling when evaluating crafted LIKE filters against delivered messages. A remote user can attach a receiver with a crafted filter and publish messages with long property values to cause a denial of service.
Exploitation requires AMQP 1.0 with stream queues in use.
Affected software
RabbitMQ Server
Remediation
Install security update from vendor's website.
RabbitMQ Server - addressed in versions 4.2.7, 4.3.1