A heimdal security update has been released for Debian GNU/Linux 11 to address a flaw.

DSA 5344-1: heimdal security update

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Debian Security Advisory DSA-5344-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
February 08, 2023   https://www.debian.org/security/faq
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Package : heimdal
CVE ID : CVE-2022-45142
Debian Bug : 1030849

Helmut Grohne discovered a flaw in Heimdal, an implementation of
Kerberos 5 that aims to be compatible with MIT Kerberos. The backports
of fixes for CVE-2022-3437 accidentally inverted important memory
comparisons in the arcfour-hmac-md5 and rc4-hmac integrity check
handlers for gssapi, resulting in incorrect validation of message
integrity codes.

For the stable distribution (bullseye), this problem has been fixed in
version 7.7.0+dfsg-2+deb11u3.

We recommend that you upgrade your heimdal packages.

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

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/