Improper handling of highly compressed data in RabbitMQ Server - #VU137251
Published: July 9, 2026
Vulnerability identifier: #VU137251
CSH Severity: Medium
CVSS v4 BT: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: N/A
CWE-ID: CWE-409
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper handling of highly compressed data in the rabbit_web_mqtt_handler WebSocket handling path when processing a highly compressed WebSocket frame with permessage-deflate enabled. A remote attacker can send a specially crafted compressed WebSocket frame to cause a denial of service.
Only systems with the rabbitmq_web_mqtt plugin enabled are vulnerable.
Affected software
RabbitMQ Server
Remediation
Install security update from vendor's website.
RabbitMQ Server - addressed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6