A krb5 security update has been released for Fedora 31.

SECURITY: Fedora 31 Update: krb5-1.17-47.fc31

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Fedora Update Notification
FEDORA-2020-0df38b2843
2020-11-21 01:51:51.654945
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Name : krb5
Product : Fedora 31
Version : 1.17
Release : 47.fc31
URL :   https://web.mit.edu/kerberos/www/
Summary : The Kerberos network authentication system
Description :
Kerberos V5 is a trusted-third-party network authentication system,
which can improve your network's security by eliminating the insecure
practice of sending passwords over the network in unencrypted form.

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Update Information:

- Fix CVE-2020-28196 (DoS in ASN.1 parsing due to missing recursion depth
checks) - fc32 + fc33 only: pull-up to rawhide
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ChangeLog:

* Thu Nov 5 2020 Robbie Harwood - 1.17-47
- Add recursion limit for ASN.1 indefinite lengths (CVE-2020-28196)
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2020-0df38b2843' at the command
line. For more information, refer to the dnf documentation available at
  http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
  https://fedoraproject.org/keys