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[USN-7805-1] HAProxy vulnerability

Posted on 06 October 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7805-1
October 06, 2025

haproxy vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

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

Software Description:
- 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.

Update instructions:

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

Ubuntu 25.04
haproxy 3.0.8-1ubuntu1.2

Ubuntu 24.04 LTS
haproxy 2.8.5-1ubuntu3.4

Ubuntu 22.04 LTS
haproxy 2.4.24-0ubuntu0.22.04.3

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

References:
https://ubuntu.com/security/notices/USN-7805-1
CVE-2025-11230

Package Information:
https://launchpad.net/ubuntu/+source/haproxy/3.0.8-1ubuntu1.2
https://launchpad.net/ubuntu/+source/haproxy/2.8.5-1ubuntu3.4
https://launchpad.net/ubuntu/+source/haproxy/2.4.24-0ubuntu0.22.04.3

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