USN-7431-1: HAProxy vulnerability

USN-7431-1: HAProxy vulnerability
10 April 2025

HAProxy could be made to crash or run programs if it received specially crafted network traffic.

Releases

• Ubuntu 24.10
• Ubuntu 24.04 LTS
• Ubuntu 22.04 LTS

Packages
haproxy - fast and reliable load balancing reverse proxy

Details
Aleandro Prudenzano and Edoardo Geraci discovered that HAProxy incorrectly
handled certain uncommon configurations that replace multiple short
patterns with a longer one. A remote attacker could use this issue to cause
HAProxy to crash, resulting in a denial of service, or possibly execute
arbitrary code.

Update instructions
The problem can be corrected by updating your system to the following package versions:

Ubuntu 24.10

• haproxy - 2.9.10-1ubuntu1.2
  Ubuntu 24.04
• haproxy - 2.8.5-1ubuntu3.3
  Ubuntu 22.04
• haproxy - 2.4.24-0ubuntu0.22.04.2

In general, a standard system update will make all the necessary changes.