SUSE-SU-2026:21138-1: important: Security update for libpng16

[SLE-UPDATES]

# Security update for libpng16

Announcement ID: SUSE-SU-2026:21138-1  
Release Date: 2026-04-07T11:57:38Z  
Rating: important  
References:

  * bsc#1260754
  * bsc#1260755

  
Cross-References:

  * CVE-2026-33416
  * CVE-2026-33636

  
CVSS scores:

  * CVE-2026-33416 ( SUSE ):  9.2
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-33416 ( SUSE ):  8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-33416 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-33636 ( SUSE ):  8.3
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-33636 ( SUSE ):  8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
  * CVE-2026-33636 ( NVD ):  7.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

  
Affected Products:

  * SUSE Linux Enterprise Server 16.0
  * SUSE Linux Enterprise Server for SAP applications 16.0

  
  
An update that solves two vulnerabilities can now be installed.

## Description:

This update for libpng16 fixes the following issues:

  * CVE-2026-33416: use-after-free via pointer aliasing in `png_set_tRNS` and
    `png_set_PLTE` can lead to arbitrary code execution (bsc#1260754).
  * CVE-2026-33636: out-of-bounds read/write in the palette expansion on ARM
    Neon can lead to information leak and crashes (bsc#1260755).

## 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 16.0  
    zypper in -t patch SUSE-SLES-16.0-480=1

  * SUSE Linux Enterprise Server for SAP applications 16.0  
    zypper in -t patch SUSE-SLES-16.0-480=1

## Package List:

  * SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
    * libpng16-devel-1.6.44-160000.6.1
    * libpng16-compat-devel-1.6.44-160000.6.1
    * libpng16-16-1.6.44-160000.6.1
    * libpng16-tools-debuginfo-1.6.44-160000.6.1
    * libpng16-tools-1.6.44-160000.6.1
    * libpng16-debugsource-1.6.44-160000.6.1
    * libpng16-16-debuginfo-1.6.44-160000.6.1
  * SUSE Linux Enterprise Server 16.0 (x86_64)
    * libpng16-devel-x86-64-v3-1.6.44-160000.6.1
    * libpng16-compat-devel-x86-64-v3-1.6.44-160000.6.1
    * libpng16-16-x86-64-v3-debuginfo-1.6.44-160000.6.1
    * libpng16-16-x86-64-v3-1.6.44-160000.6.1
  * SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
    * libpng16-devel-1.6.44-160000.6.1
    * libpng16-compat-devel-1.6.44-160000.6.1
    * libpng16-16-1.6.44-160000.6.1
    * libpng16-tools-debuginfo-1.6.44-160000.6.1
    * libpng16-tools-1.6.44-160000.6.1
    * libpng16-debugsource-1.6.44-160000.6.1
    * libpng16-16-debuginfo-1.6.44-160000.6.1
  * SUSE Linux Enterprise Server for SAP applications 16.0 (x86_64)
    * libpng16-devel-x86-64-v3-1.6.44-160000.6.1
    * libpng16-compat-devel-x86-64-v3-1.6.44-160000.6.1
    * libpng16-16-x86-64-v3-debuginfo-1.6.44-160000.6.1
    * libpng16-16-x86-64-v3-1.6.44-160000.6.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-33416.html
  * https://www.suse.com/security/cve/CVE-2026-33636.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1260754
  * https://bugzilla.suse.com/show_bug.cgi?id=1260755

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