SUSE-SU-2026:4402-1: important: Security update for python-PyYAML

[SLE-UPDATES]

# Security update for python-PyYAML

Announcement ID: SUSE-SU-2026:4402-1  
Release Date: 2026-09-30T08:58:27Z  
Rating: important  
References:

  * bsc#1174514

  
Cross-References:

  * CVE-2020-14343

  
CVSS scores:

  * CVE-2020-14343 ( SUSE ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2020-14343 ( NVD ):  9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  
Affected Products:

  * Public Cloud Module 12
  * SUSE Linux Enterprise High Performance Computing 12 SP2
  * SUSE Linux Enterprise High Performance Computing 12 SP3
  * SUSE Linux Enterprise High Performance Computing 12 SP4
  * SUSE Linux Enterprise High Performance Computing 12 SP5
  * SUSE Linux Enterprise Server 12
  * SUSE Linux Enterprise Server 12 SP1
  * SUSE Linux Enterprise Server 12 SP2
  * SUSE Linux Enterprise Server 12 SP3
  * SUSE Linux Enterprise Server 12 SP4
  * SUSE Linux Enterprise Server 12 SP5
  * SUSE Linux Enterprise Server 12 SP5 LTSS
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security
  * SUSE Linux Enterprise Server for SAP Applications 12
  * SUSE Linux Enterprise Server for SAP Applications 12 SP1
  * SUSE Linux Enterprise Server for SAP Applications 12 SP2
  * SUSE Linux Enterprise Server for SAP Applications 12 SP3
  * SUSE Linux Enterprise Server for SAP Applications 12 SP4
  * SUSE Linux Enterprise Server for SAP Applications 12 SP5

  
  
An update that solves one vulnerability can now be installed.

## Description:

This update for python-PyYAML fixes the following issues:

  * Update to 5.3.1.

  * CVE-2020-14343: A vulnerability was discovered in the PyYAML library, where
    it was susceptible to arbitrary code execution when it processes untrusted
    YAML files through the full_load method or with the FullLoader loader.
    Applications that use the library to process untrusted input may be
    vulnerable to this flaw. This flaw allows an attacker to execute arbitrary
    code on the system by abusing the python/object/new constructor. This flaw
    is due to an incomplete fix for CVE-2020-1747.

## 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:

  * Public Cloud Module 12  
    zypper in -t patch SUSE-SLE-Module-Public-Cloud-12-2026-4402

  * SUSE Linux Enterprise Server 12 SP5 LTSS  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-2026-4402

  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-4402

## Package List:

  * Public Cloud Module 12 (aarch64 ppc64le s390x x86_64)
    * python3-PyYAML-5.3.1-32.1
    * python3-PyYAML-debuginfo-5.3.1-32.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS (aarch64 ppc64le s390x x86_64)
    * python3-PyYAML-5.3.1-32.1
    * python3-PyYAML-debuginfo-5.3.1-32.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (x86_64)
    * python3-PyYAML-5.3.1-32.1
    * python3-PyYAML-debuginfo-5.3.1-32.1

## References:

  * https://www.suse.com/security/cve/CVE-2020-14343.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1174514

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