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openSUSE Leap 16.0 krb5 Moderate Denial of Service Vuln 2026-21021-1

opensuse
Calendar Grey June 30, 2026
Dist Opensuse Esm H88
Apply the openSUSE update for krb5 addressing denial of service issues with moderate severity and bug fixes.
An update that solves 2 vulnerabilities and has 2 bug fixes can now be installed.

Description

This update for krb5 fixes the following issues

- CVE-2026-40355: Denial of Service via NULL pointer dereference in NegoEx mechanism (bsc#1263366).

- CVE-2026-40356: Denial of Service via integer underflow and out-of-bounds read (bsc#1263367).

Patch instructions:

To install this openSUSE security update use the suse recommended installation methods

like YaST online_update or "zypper patch".

Alternatively you can run the command listed for your product:

- openSUSE Leap 16.0

zypper in -t patch openSUSE-Leap-16.0-1033=1

Topics%20covered

Topics Covered

security advisory moderate denial of service patch krb5 OpenSUSE

Patch

Package List

- openSUSE Leap 16.0:

krb5-1.21.3-160000.3.1

krb5-client-1.21.3-160000.3.1

krb5-devel-1.21.3-160000.3.1

krb5-plugin-kdb-ldap-1.21.3-160000.3.1

krb5-plugin-preauth-otp-1.21.3-160000.3.1

krb5-plugin-preauth-pkinit-1.21.3-160000.3.1

krb5-plugin-preauth-spake-1.21.3-160000.3.1

krb5-server-1.21.3-160000.3.1

References

* bsc#1263366

* bsc#1263367

References:

* https://www.suse.com/security/cve/CVE-2026-40355.html

* https://www.suse.com/security/cve/CVE-2026-40356.html

Severity
moderate
Lowest
Low
Medium
High
Critical

Announcement ID: openSUSE-SU-2026:21021-1
Rating: moderate
Affected Products: openSUSE Leap 16.0 -------------------------------------------------------------

Topics%20covered

Topics Covered

security advisory moderate denial of service patch krb5 OpenSUSE

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