Packages
- 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)
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
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 | ||
|---|---|---|---|
| 26.04 LTS resolute | haproxy – 3.2.9-1ubuntu2.2 | ||
| 25.10 questing | haproxy – 3.0.12-0ubuntu0.25.10.5 | ||
| 24.04 LTS noble | haproxy – 2.8.16-0ubuntu0.24.04.3 | ||
| 22.04 LTS jammy | haproxy – 2.4.30-0ubuntu0.22.04.2 | ||
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