A HAProxy security update has been released for Ubuntu Linux 20.04 LTS and 21.04.

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Ubuntu Security Notice USN-5042-1
August 17, 2021

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

- Ubuntu 21.04
- Ubuntu 20.04 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 HTTP/2 protocol. A
remote attacker could possibly use this issue to bypass restrictions.

Update instructions:

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

Ubuntu 21.04:
haproxy 2.2.9-1ubuntu0.1

Ubuntu 20.04 LTS:
haproxy 2.0.13-2ubuntu0.2

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

References:
  https://ubuntu.com/security/notices/USN-5042-1
  https://launchpad.net/bugs/1940314

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