A krb5 security update has been released for Debian GNU/Linux 11 to address integer overflow flaws.

DSA 5286-1: krb5 security update

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Debian Security Advisory DSA-5286-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
November 19, 2022   https://www.debian.org/security/faq
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Package : krb5
CVE ID : CVE-2022-42898
Debian Bug : 1024267

Greg Hudson discovered integer overflow flaws in the PAC parsing in
krb5, the MIT implementation of Kerberos, which may result in remote
code execution (in a KDC, kadmin, or GSS or Kerberos application server
process), information exposure (to a cross-realm KDC acting
maliciously), or denial of service (KDC or kadmind process crash).

For the stable distribution (bullseye), this problem has been fixed in
version 1.18.3-6+deb11u3.

We recommend that you upgrade your krb5 packages.

For the detailed security status of krb5 please refer to its security
tracker page at:
  https://security-tracker.debian.org/tracker/krb5

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/