------------------------------------------------------------------------- Debian LTS Advisory DLA-4603-1 [email protected] https://www.debian.org/lts/security/ Emmanuel Arias May 28, 2026 https://wiki.debian.org/LTS -------------------------------------------------------------------------
Package : krb5
Version : 1.18.3-6+deb11u8
CVE ID : CVE-2026-40355 CVE-2026-40356
Debian Bug : 1135317
Two vulnerabilities was found in krb5, the MIT implementation of Kerberos, that
an unauthenticated remote attacker can take advantage of these vulnerabilities
to cause a denial of service.
CVE-2026-40355
If an application calls gss_accept_sec_context() on a system with a NegoEx
mechanism registered in /etc/gss/mech, an unauthenticated remote attacker
can trigger a null pointer dereference, causing the process to terminate.
CVE-2026-40356
If an application calls gss_accept_sec_context() on a system with a NegoEx
mechanism registered in /etc/gss/mech, an unauthenticated remote attacker
can trigger a read overrun of up to 52 bytes, possibly causing the process
to terminate. Exfiltration of the bytes read does not appear possible.
For Debian 11 bullseye, these problems have been fixed in version
1.18.3-6+deb11u8.
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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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