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openSUSE 15.5 Advisory ID SUSE-2026-1816-1 CVE-2026-40355 Moderate DoS

suse
Calendar Grey May 13, 2026
Scroller Suse
Update for krb5 resolves two Denial of Service issues in openSUSE Leap 15.5 and SUSE Linux Enterprise Micro 5.5.
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: * openSUSE Leap 15.5 zypper in -t patch SUSE-2026-1816=1 * SUSE Linux Enterprise Micro 5.5 zypper in -t patch SUSE-SLE-Micro-5.5-2026-1816=1 ## Package List: * openSUSE Leap 15.5 (aarch64 ppc64le s390x x86_64 i586) * krb5-plugin-preauth-otp-1.20.1-150500.3.20.1 * krb5-plugin-preauth-spake-1.20.1-150500.3.20.1 * krb5-mini-devel-1.20.1-150500.3.20.1

Topics%20covered

Topics Covered

security advisory moderate denial of service krb5 OpenSUSE patch instructions

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:

* openSUSE Leap 15.5

* SUSE Linux Enterprise Micro 5.5

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

Announcement ID: SUSE-SU-2026:1816-1
Release Date: 2026-05-12T07:56:38Z
Rating: moderate

Topics%20covered

Topics Covered

security advisory moderate denial of service krb5 OpenSUSE patch instructions

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