SUSE-SU-2026:1816-1: moderate: Security update for krb5

[SLE-SECURITY-UPDATES]

# Security update for krb5

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

  * bsc#1263366
  * bsc#1263367

  
Cross-References:

  * 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.

## 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 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
    * krb5-plugin-preauth-spake-debuginfo-1.20.1-150500.3.20.1
    * krb5-plugin-preauth-otp-debuginfo-1.20.1-150500.3.20.1
    * krb5-plugin-preauth-pkinit-debuginfo-1.20.1-150500.3.20.1
    * krb5-client-debuginfo-1.20.1-150500.3.20.1
    * krb5-mini-debuginfo-1.20.1-150500.3.20.1
    * krb5-devel-1.20.1-150500.3.20.1
    * krb5-mini-debugsource-1.20.1-150500.3.20.1
    * krb5-debugsource-1.20.1-150500.3.20.1
    * krb5-server-debuginfo-1.20.1-150500.3.20.1
    * krb5-client-1.20.1-150500.3.20.1
    * krb5-mini-1.20.1-150500.3.20.1
    * krb5-plugin-kdb-ldap-debuginfo-1.20.1-150500.3.20.1
    * krb5-1.20.1-150500.3.20.1
    * krb5-plugin-kdb-ldap-1.20.1-150500.3.20.1
    * krb5-server-1.20.1-150500.3.20.1
    * krb5-plugin-preauth-pkinit-1.20.1-150500.3.20.1
    * krb5-debuginfo-1.20.1-150500.3.20.1
  * openSUSE Leap 15.5 (x86_64)
    * krb5-32bit-1.20.1-150500.3.20.1
    * krb5-devel-32bit-1.20.1-150500.3.20.1
    * krb5-32bit-debuginfo-1.20.1-150500.3.20.1
  * openSUSE Leap 15.5 (aarch64_ilp32)
    * krb5-64bit-debuginfo-1.20.1-150500.3.20.1
    * krb5-devel-64bit-1.20.1-150500.3.20.1
    * krb5-64bit-1.20.1-150500.3.20.1
  * SUSE Linux Enterprise Micro 5.5 (aarch64 ppc64le s390x x86_64)
    * krb5-client-1.20.1-150500.3.20.1
    * krb5-1.20.1-150500.3.20.1
    * krb5-debugsource-1.20.1-150500.3.20.1
    * krb5-debuginfo-1.20.1-150500.3.20.1

## References:

  * 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

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