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Ubuntu 25.04: HAProxy Critical Denial of Service CVE-2025-11230

ubuntu
Calendar Grey October 6, 2025
Dist Ubuntu Esm H88
HAProxy undergoes critical update to fix crash vulnerability from crafted network traffic. Ensure your system is updated.
HAProxy could be made to crash if it received specially crafted network traffic.

Summary

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

traffic.

Software Description:

- haproxy: fast and reliable load balancing reverse proxy

Details:

Oula Kivalo discovered that HAProxy incorrectly handled parsing certain

json numbers. A remote attacker could possibly use this issue to cause

HAProxy to crash, resulting in a denial of service.

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu network traffic haproxy

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.04
  haproxy                         3.0.8-1ubuntu1.2

Ubuntu 24.04 LTS
  haproxy                         2.8.5-1ubuntu3.4

Ubuntu 22.04 LTS
  haproxy                         2.4.24-0ubuntu0.22.04.3

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7805-1

CVE-2025-11230

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7805-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu network traffic haproxy

Package Information

https://launchpad.net/ubuntu/+source/haproxy/3.0.8-1ubuntu1.2
https://launchpad.net/ubuntu/+source/haproxy/2.8.5-1ubuntu3.4

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