SUSE-SU-2026:4024-1: important: Security update for LibVNCServer

[SLE-SECURITY-UPDATES]

# Security update for LibVNCServer

Announcement ID: SUSE-SU-2026:4024-1  
Release Date: 2026-09-07T07:43:10Z  
Rating: important  
References:

  * bsc#1276218

  
Cross-References:

  * CVE-2026-50538

  
CVSS scores:

  * CVE-2026-50538 ( SUSE ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-50538 ( NVD ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

  
Affected Products:

  * SUSE Linux Enterprise High Performance Computing 12 SP5
  * SUSE Linux Enterprise Server 12 SP5
  * SUSE Linux Enterprise Server 12 SP5 LTSS
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security
  * SUSE Linux Enterprise Server for SAP Applications 12 SP5

  
  
An update that solves one vulnerability can now be installed.

## Description:

This update for LibVNCServer fixes the following issue:

  * CVE-2026-50538: a malicious (or man-in-the-middle) VNC server can force a
    connecting `libvncclient` to write attacker- controlled data past the end of
    its framebuffer (bsc#1276218).

## 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 Enterprise Server 12 SP5 LTSS Extended Security  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-4024=1

  * SUSE Linux Enterprise Server 12 SP5 LTSS  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-2026-4024=1

## Package List:

  * SUSE Linux Enterprise Server 12 SP5 LTSS (aarch64 ppc64le s390x x86_64)
    * LibVNCServer-devel-0.9.9-17.50.1
    * LibVNCServer-debugsource-0.9.9-17.50.1
    * libvncserver0-0.9.9-17.50.1
    * libvncclient0-0.9.9-17.50.1
    * libvncserver0-debuginfo-0.9.9-17.50.1
    * libvncclient0-debuginfo-0.9.9-17.50.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (x86_64)
    * LibVNCServer-devel-0.9.9-17.50.1
    * LibVNCServer-debugsource-0.9.9-17.50.1
    * libvncserver0-0.9.9-17.50.1
    * libvncclient0-0.9.9-17.50.1
    * libvncserver0-debuginfo-0.9.9-17.50.1
    * libvncclient0-debuginfo-0.9.9-17.50.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-50538.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1276218

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