A haproxy security update has been released for Debian GNU/Linux 11 to address a flaw that can result in an unbounded loop, causing a denial of service.

DSA 5102-1: haproxy security update

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Debian Security Advisory DSA-5102-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
March 13, 2022   https://www.debian.org/security/faq
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Package : haproxy
CVE ID : CVE-2022-0711

A flaw was discovered in the way HAProxy, a fast and reliable load
balancing reverse proxy, processes HTTP responses containing the
"Set-Cookie2" header, which can result in an unbounded loop, causing a
denial of service.

For the stable distribution (bullseye), this problem has been fixed in
version 2.2.9-2+deb11u3.

We recommend that you upgrade your haproxy packages.

For the detailed security status of haproxy please refer to its security
tracker page at:
  https://security-tracker.debian.org/tracker/haproxy

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/