Security update for zlib

Announcement ID: SUSE-SU-2026:21013-1
Release Date: 2026-04-09T11:25:32Z
Rating: moderate
References:
Cross-References:
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 6.2

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 6.2
    zypper in -t patch SUSE-SL-Micro-6.2-502=1

Package List:

  • SUSE Linux Micro 6.2 (aarch64 ppc64le s390x x86_64)
    • zlib-devel-1.2.13-160000.3.1
    • libz1-1.2.13-160000.3.1
    • zlib-debugsource-1.2.13-160000.3.1
    • libz1-debuginfo-1.2.13-160000.3.1

References: