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Debian krb5 Important NegoEx Denial of Service Vuln DSA-6293-1

debian
Calendar Grey May 22, 2026
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Mitigate Denial of Service risks in krb5 with the latest Debian advisory DSA-6293-1 addressing critical vulnerabilities.
Cem Onat Karagun discovered two vulnerabilities in the NegoEx parsing in krb5, the MIT implementation of Kerberos
Topics%20covered

Topics Covered

security advisory denial of service debian important krb5 negoex

Summary

For the oldstable distribution (bookworm), this problem has been fixed
in version 1.20.1-2+deb12u5.

For the stable distribution (trixie), this problem has been fixed in
version 1.21.3-5+deb13u1.

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/



Severity
important
Lowest
Low
Medium
High
Critical

Package: krb5
CVE ID: CVE-2026-40355

Topics%20covered

Topics Covered

security advisory denial of service debian important krb5 negoex

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