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[USN-8036-1] HAProxy vulnerability

Posted on 13 February 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8036-1
February 12, 2026

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

- Ubuntu 25.10

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:

Asim Viladi Oglu Manizada discovered that HAProxy incorrectly handled
certain INITIAL packets. 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 25.10
haproxy 3.0.12-0ubuntu0.25.10.3

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

References:
https://ubuntu.com/security/notices/USN-8036-1
CVE-2026-26081

Package Information:
https://launchpad.net/ubuntu/+source/haproxy/3.0.12-0ubuntu0.25.10.3

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