A HAProxy security update has been released for Ubuntu Linux 20.04 LTS and 21.10.

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Ubuntu Security Notice USN-5312-1
March 03, 2022

haproxy vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.10
- Ubuntu 20.04 LTS

Summary:

HAProxy could be made to stop responding if it received specially crafted
network traffic.

Software Description:
- haproxy: fast and reliable load balancing reverse proxy

Details:

It was discovered that HAProxy incorrectly handled certain headers. A
remote attacker could possibly use this issue to cause HAProxy to stop
responding, resulting in a denial of service.

Update instructions:

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

Ubuntu 21.10:
haproxy 2.2.9-2ubuntu2.1

Ubuntu 20.04 LTS:
haproxy 2.0.13-2ubuntu0.5

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

References:
  https://ubuntu.com/security/notices/USN-5312-1
CVE-2022-0711

Package Information:
  https://launchpad.net/ubuntu/+source/haproxy/2.2.9-2ubuntu2.1
  https://launchpad.net/ubuntu/+source/haproxy/2.0.13-2ubuntu0.5