SUSE-SU-2026:5138-1: moderate: Security update for zchunk

[SLE-SECURITY-UPDATES]

# Security update for zchunk

Announcement ID: SUSE-SU-2026:5138-1  
Release Date: 2026-11-09T13:00:50Z  
Rating: moderate  
References:

  * bsc#1288144

  
Cross-References:

  * CVE-2026-117556

  
CVSS scores:

  * CVE-2026-117556 ( SUSE ):  6.8
    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-117556 ( SUSE ):  5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
  * CVE-2026-117556 ( NVD ):  5.3
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-117556 ( NVD ):  4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

  
Affected Products:

  * Basesystem Module 15-SP7
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Real Time 15 SP7
  * SUSE Linux Enterprise Server 15 SP7
  * SUSE Linux Enterprise Server for SAP Applications 15 SP7

  
  
An update that solves one vulnerability can now be installed.

## Description:

This update for zchunk fixes the following issue:

  * CVE-2026-117556: heap out-of-bounds read in `read_preface()` allows
    attackers to cause an application crash via a crafted `.zck` file
    (bsc#1288144).

## 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:

  * Basesystem Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-5138

## Package List:

  * Basesystem Module 15-SP7 (aarch64 ppc64le s390x x86_64)
    * zchunk-debugsource-1.5.1-150700.3.3.1
    * zchunk-1.5.1-150700.3.3.1
    * libzck1-debuginfo-1.5.1-150700.3.3.1
    * libzck-devel-1.5.1-150700.3.3.1
    * libzck1-1.5.1-150700.3.3.1
    * zchunk-debuginfo-1.5.1-150700.3.3.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-117556.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1288144

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