USN-8972-1: HAProxy vulnerabilities

Publication date

3 November 2026

Overview

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


Packages

  • haproxy - fast and reliable load balancing reverse proxy

Details

It was discovered that HAProxy incorrectly handled truncated HTTP/2
PING frames. A remote attacker could possibly use this issue to cause
HAProxy to consume excessive CPU resources, leading to a denial of
service. (CVE-2026-110353)

It was discovered that HAProxy incorrectly handled certain HTTP/1.1
chunked requests. A remote attacker could possibly use this issue to
cause HAProxy to consume excessive CPU resources, leading to a denial
of service. (CVE-2026-110354)

It was discovered that HAProxy incorrectly handled truncated HTTP/2
PING frames. A remote attacker could possibly use this issue to cause
HAProxy to consume excessive CPU resources, leading to a denial of
service. (CVE-2026-110353)

It was discovered that HAProxy incorrectly handled certain HTTP/1.1
chunked requests. A remote attacker could possibly use this issue to
cause HAProxy to consume excessive CPU resources, leading to a denial
of service. (CVE-2026-110354)

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
26.10 stonking haproxy –  3.4.2-1ubuntu4.1
26.04 LTS resolute haproxy –  3.2.25-0ubuntu0.26.04.2
24.04 LTS noble haproxy –  2.8.30-0ubuntu0.24.04.2
22.04 LTS jammy haproxy –  2.4.30-0ubuntu0.22.04.3

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