A krb5 security update has been released for Debian GNU/Linux 10 to address an issue that could result in denial of service.

DSA 4795-1: krb5 security update

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Debian Security Advisory DSA-4795-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
November 21, 2020   https://www.debian.org/security/faq
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Package : krb5
CVE ID : CVE-2020-28196

Demi Obeneour discovered that unbounded recursion in the ASN1 parser
of libkrb5 could result in denial of service.

For the stable distribution (buster), this problem has been fixed in
version 1.17-3+deb10u1.

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/