USN-7805-1: HAProxy vulnerability

Publication date

6 October 2025

Overview

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


Packages

  • haproxy - fast and reliable load balancing reverse proxy

Details

Oula Kivalo discovered that HAProxy incorrectly handled parsing certain
json numbers. A remote attacker could possibly use this issue to cause
HAProxy to crash, resulting in a denial of service.

Oula Kivalo discovered that HAProxy incorrectly handled parsing certain
json numbers. A remote attacker could possibly use this issue to cause
HAProxy to crash, resulting in a denial of service.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
25.04 plucky haproxy –  3.0.8-1ubuntu1.2
24.04 LTS noble haproxy –  2.8.5-1ubuntu3.4
22.04 LTS jammy haproxy –  2.4.24-0ubuntu0.22.04.3

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