SUSE-SU-2026:0783-1: moderate: Security update for zlib

[SLE-SECURITY-UPDATES]

# Security update for zlib

Announcement ID: SUSE-SU-2026:0783-1  
Release Date: 2026-03-03T13:36:31Z  
Rating: moderate  
References:

  * bsc#1258392

  
Cross-References:

  * CVE-2026-27171

  
CVSS scores:

  * 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:

  * Basesystem Module 15-SP7
  * Development Tools Module 15-SP7
  * openSUSE Leap 15.5
  * openSUSE Leap 15.6
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Micro 5.5
  * 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 zlib fixes the following issue:

  * CVE-2026-27171: Fixed infinite loop via the `crc32_combine64` and
    `crc32_combine_gen64` functions due to missing checks for negative lengths
    (bsc#1258392).

## 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:

  * Development Tools Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Development-Tools-15-SP7-2026-783=1

  * openSUSE Leap 15.5  
    zypper in -t patch SUSE-2026-783=1

  * openSUSE Leap 15.6  
    zypper in -t patch openSUSE-SLE-15.6-2026-783=1

  * SUSE Linux Enterprise Micro 5.5  
    zypper in -t patch SUSE-SLE-Micro-5.5-2026-783=1

  * Basesystem Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-783=1

## Package List:

  * Development Tools Module 15-SP7 (x86_64)
    * zlib-devel-32bit-1.2.13-150500.4.6.1
  * openSUSE Leap 15.5 (aarch64 ppc64le s390x x86_64 i586)
    * zlib-devel-static-1.2.13-150500.4.6.1
    * zlib-testsuite-debuginfo-1.2.13-150500.4.6.1
    * libminizip1-debuginfo-1.2.13-150500.4.6.1
    * libminizip1-1.2.13-150500.4.6.1
    * zlib-devel-1.2.13-150500.4.6.1
    * zlib-testsuite-1.2.13-150500.4.6.1
    * libz1-1.2.13-150500.4.6.1
    * zlib-debugsource-1.2.13-150500.4.6.1
    * libz1-debuginfo-1.2.13-150500.4.6.1
    * minizip-devel-1.2.13-150500.4.6.1
  * openSUSE Leap 15.5 (x86_64)
    * libz1-32bit-debuginfo-1.2.13-150500.4.6.1
    * libz1-32bit-1.2.13-150500.4.6.1
    * zlib-devel-static-32bit-1.2.13-150500.4.6.1
    * libminizip1-32bit-debuginfo-1.2.13-150500.4.6.1
    * zlib-devel-32bit-1.2.13-150500.4.6.1
    * libminizip1-32bit-1.2.13-150500.4.6.1
  * openSUSE Leap 15.5 (aarch64_ilp32)
    * libminizip1-64bit-debuginfo-1.2.13-150500.4.6.1
    * libz1-64bit-1.2.13-150500.4.6.1
    * libz1-64bit-debuginfo-1.2.13-150500.4.6.1
    * zlib-devel-64bit-1.2.13-150500.4.6.1
    * zlib-devel-static-64bit-1.2.13-150500.4.6.1
    * libminizip1-64bit-1.2.13-150500.4.6.1
  * openSUSE Leap 15.6 (aarch64 ppc64le s390x x86_64)
    * zlib-devel-static-1.2.13-150500.4.6.1
    * zlib-testsuite-debuginfo-1.2.13-150500.4.6.1
    * libminizip1-debuginfo-1.2.13-150500.4.6.1
    * libminizip1-1.2.13-150500.4.6.1
    * zlib-devel-1.2.13-150500.4.6.1
    * zlib-testsuite-1.2.13-150500.4.6.1
    * libz1-1.2.13-150500.4.6.1
    * zlib-debugsource-1.2.13-150500.4.6.1
    * libz1-debuginfo-1.2.13-150500.4.6.1
    * minizip-devel-1.2.13-150500.4.6.1
  * openSUSE Leap 15.6 (x86_64)
    * libz1-32bit-debuginfo-1.2.13-150500.4.6.1
    * libz1-32bit-1.2.13-150500.4.6.1
    * zlib-devel-static-32bit-1.2.13-150500.4.6.1
    * libminizip1-32bit-debuginfo-1.2.13-150500.4.6.1
    * zlib-devel-32bit-1.2.13-150500.4.6.1
    * libminizip1-32bit-1.2.13-150500.4.6.1
  * SUSE Linux Enterprise Micro 5.5 (aarch64 ppc64le s390x x86_64)
    * libz1-debuginfo-1.2.13-150500.4.6.1
    * zlib-devel-1.2.13-150500.4.6.1
    * zlib-debugsource-1.2.13-150500.4.6.1
    * libz1-1.2.13-150500.4.6.1
  * Basesystem Module 15-SP7 (aarch64 ppc64le s390x x86_64)
    * zlib-devel-static-1.2.13-150500.4.6.1
    * libminizip1-debuginfo-1.2.13-150500.4.6.1
    * libminizip1-1.2.13-150500.4.6.1
    * zlib-devel-1.2.13-150500.4.6.1
    * libz1-1.2.13-150500.4.6.1
    * zlib-debugsource-1.2.13-150500.4.6.1
    * libz1-debuginfo-1.2.13-150500.4.6.1
    * minizip-devel-1.2.13-150500.4.6.1
  * Basesystem Module 15-SP7 (x86_64)
    * libz1-32bit-debuginfo-1.2.13-150500.4.6.1
    * libz1-32bit-1.2.13-150500.4.6.1

## References:

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

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