A krb5 security update has been released for Fedora 34.

SECURITY: Fedora 34 Update: krb5-1.19.2-2.fc34

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Fedora Update Notification
FEDORA-2021-20b495cb94
2021-08-21 01:05:40.547392
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Name : krb5
Product : Fedora 34
Version : 1.19.2
Release : 2.fc34
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:

- CVE-2021-37750 (explicit NULL deref on KDC)
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ChangeLog:

* Thu Aug 19 2021 Robbie Harwood - 1.19.2-2
- Fix KDC null deref on TGS inner body null server (CVE-2021-37750)
* Mon Jul 26 2021 Robbie Harwood - 1.19.2-1
- New upstream version (1.19.2)
* Wed Jul 21 2021 Robbie Harwood - 1.19.1-15
- Fix defcred leak in krb5 gss_inquire_cred()
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-20b495cb94' 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