SUSE-SU-2026:20659-1: moderate: Security update for zlib

[SLE-UPDATES]

# Security update for zlib

Announcement ID: SUSE-SU-2026:20659-1  
Release Date: 2026-03-09T10:25:10Z  
Rating: moderate  
References:

  * bsc#1216378
  * bsc#1258392

  
Cross-References:

  * CVE-2023-45853
  * CVE-2026-27171

  
CVSS scores:

  * CVE-2023-45853 ( SUSE ):  5.3 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2023-45853 ( NVD ):  9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-45853 ( NVD ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-27171 ( SUSE ):  6.9
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-27171 ( SUSE ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-27171 ( NVD ):  2.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
  * CVE-2026-27171 ( NVD ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  
Affected Products:

  * SUSE Linux Micro 6.1

  
  
An update that solves two vulnerabilities can now be installed.

## Description:

This update for zlib fixes the following issues:

  * CVE-2026-27171: Fixed an infinite loop via the crc32_combine64 and
    crc32_combine_gen64 functions due to missing checks for negative lengths.
    (bsc#1258392)
  * CVE-2023-45853: Fixed an integer overflow and resultant heap-based buffer
    overflow in zipOpenNewFileInZip4_6. (bsc#1216378)

## 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 6.1  
    zypper in -t patch SUSE-SLE-Micro-6.1-432=1

## Package List:

  * SUSE Linux Micro 6.1 (aarch64 ppc64le s390x x86_64)
    * zlib-debugsource-1.2.13-slfo.1.1_2.1
    * zlib-devel-1.2.13-slfo.1.1_2.1
    * libz1-1.2.13-slfo.1.1_2.1
    * libz1-debuginfo-1.2.13-slfo.1.1_2.1

## References:

  * https://www.suse.com/security/cve/CVE-2023-45853.html
  * https://www.suse.com/security/cve/CVE-2026-27171.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1216378
  * https://bugzilla.suse.com/show_bug.cgi?id=1258392

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