========================================================================== Ubuntu Security Notice USN-8459-1 June 22, 2026
haproxy vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Several security issues were fixed in HAProxy. Software Description: - haproxy: fast and reliable load balancing reverse proxy Details: It was discovered that HAProxy incorrectly handled the FCGI demultiplexer record length field. A remote attacker could possibly use this issue to cause incorrect request routing, response smuggling, or other memory safety issues. (CVE-2026-55203) It was discovered that HAProxy failed to validate the return value of the HPACK dynamic table defragmentation function when memory was exhausted. A remote attacker could possibly use this issue to cause HAProxy to crash, resulting in a denial of service. (CVE-2026-55204) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS haproxy 3.2.9-1ubuntu2.2 Ubuntu 25.10 haproxy 3.0.12-0ubuntu0.25.10.5 Ubuntu 24.04 LTS haproxy 2.8.16-0ubuntu0.24.04.3 Ubuntu 22.04 LTS haproxy 2.4.30-0ubuntu0.22.04.2 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8459-1 CVE-2026-55203, CVE-2026-55204 Package Information: https://launchpad.net/ubuntu/+source/haproxy/3.2.9-1ubuntu2.2 https://launchpad.net/ubuntu/+source/haproxy/3.0.12-0ubuntu0.25.10.5 https://launchpad.net/ubuntu/+source/haproxy/2.8.16-0ubuntu0.24.04.3 https://launchpad.net/ubuntu/+source/haproxy/2.4.30-0ubuntu0.22.04.2
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