USN-8972-2: HAProxy regression
Publication date
5 November 2026
Overview
USN-8972-1 introduced a regression in HAProxy
Releases
Packages
- haproxy - fast and reliable load balancing reverse proxy
Details
USN-8972-1 fixed vulnerabilities in HAProxy. On Ubuntu 22.04 LTS, the
update caused a regression when processing certain chunked requests. This
update fixes the problem.
We apologize for the inconvenience.
Original advisory 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)
USN-8972-1 fixed vulnerabilities in HAProxy. On Ubuntu 22.04 LTS, the
update caused a regression when processing certain chunked requests. This
update fixes the problem.
We apologize for the inconvenience.
Original advisory 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)
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 | ||
|---|---|---|---|
| 22.04 LTS jammy | haproxy – 2.4.30-0ubuntu0.22.04.4 | ||
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