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SUSE krb5 Moderate Denial of Service Security Update 2026-22255-1

suse
Calendar Grey June 29, 2026
Dist Suse Esm H88
SUSE releases security update for krb5 addressing critical issues impacting service integrity through potential Denial of Service.
An update that solves two vulnerabilities can now be installed.

Summary

## 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 SUSE update use the SUSE recommended installation methods like YaST online_update or "zypper patch". Alternatively you can run the command listed for your product: * SUSE Linux Micro 6.2 zypper in -t patch SUSE-SL-Micro-6.2-1033=1 ## Package List: * SUSE Linux Micro 6.2 (aarch64 ppc64le s390x x86_64) * krb5-client-debuginfo-1.21.3-160000.3.1 * krb5-client-1.21.3-160000.3.1 * krb5-1.21.3-160000.3.1 * krb5-debuginfo-1.21.3-160000.3.1 * krb5-debugsource-1.21.3-160000.3.1

Topics%20covered

Topics Covered

security advisory moderate denial of service update SuSE krb5

References

* bsc#1263366

* bsc#1263367

Cross-

* CVE-2026-40355

* CVE-2026-40356

CVSS scores:

* CVE-2026-40355 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

* CVE-2026-40355 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

* CVE-2026-40356 ( SUSE ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

* CVE-2026-40356 ( NVD ): 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products:

* SUSE Linux Micro 6.2

An update that solves two vulnerabilities can now be installed.

##

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

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

* https://bugzilla.suse.com/show_bug.cgi?id=1263366

* https://bugzilla.suse.com/show_bug.cgi?id=1263367

Severity
moderate
Lowest
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Critical

Announcement ID: SUSE-SU-2026:22255-1
Release Date: 2026-06-22T14:35:17Z
Rating: moderate

Topics%20covered

Topics Covered

security advisory moderate denial of service update SuSE krb5

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