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[USN-8208-1] HAProxy vulnerability

Posted on 27 April 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8208-1
April 27, 2026

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

- Ubuntu 25.10
- Ubuntu 24.04 LTS

Summary:

HAProxy could be made to expose sensitive information over the network.

Software Description:
- haproxy: fast and reliable load balancing reverse proxy

Details:

Martino Spagnuolo discovered that HAProxy did not check received body
lengths in the HTTP/3 parser. A remote attacker could possibly use this
issue to perform a request smuggling attack and obtain sensitive
information.

Update instructions:

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

Ubuntu 25.10
haproxy 3.0.12-0ubuntu0.25.10.4

Ubuntu 24.04 LTS
haproxy 2.8.16-0ubuntu0.24.04.2

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

References:
https://ubuntu.com/security/notices/USN-8208-1
CVE-2026-33555

Package Information:
https://launchpad.net/ubuntu/+source/haproxy/3.0.12-0ubuntu0.25.10.4
https://launchpad.net/ubuntu/+source/haproxy/2.8.16-0ubuntu0.24.04.2

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