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Ubuntu 25.10 HAProxy Critical Info Exposure USN-8208-1 CVE-2026-33555

ubuntu
Calendar Grey April 27, 2026
Dist Ubuntu Esm H88
HAProxy exposes sensitive information over the network. Update to prevent potential attacks on Ubuntu systems.
HAProxy could be made to expose sensitive information over the network.

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.

Topics%20covered

Topics Covered

security advisory critical Ubuntu sensitive information request smuggling haproxy

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8208-1

Topics%20covered

Topics Covered

security advisory critical Ubuntu sensitive information request smuggling haproxy

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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