SUSE-SU-2026:2259-1: moderate: Security update for python3-pyOpenSSL

[SLE-UPDATES]

# Security update for python3-pyOpenSSL

Announcement ID: SUSE-SU-2026:2259-1  
Release Date: 2026-06-03T15:31:51Z  
Rating: moderate  
References:

  * bsc#1262803

  
Cross-References:

  * CVE-2026-40475

  
CVSS scores:

  * CVE-2026-40475 ( SUSE ):  6.8
    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-40475 ( SUSE ):  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
  * openSUSE Leap 15.4
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Micro 5.3
  * SUSE Linux Enterprise Micro 5.4
  * SUSE Linux Enterprise Micro 5.5
  * SUSE Linux Enterprise Micro for Rancher 5.3
  * SUSE Linux Enterprise Micro for Rancher 5.4
  * 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 python3-pyOpenSSL fixes the following issue

  * CVE-2026-40475: improper input handling of null bytes can lead to silent
    data truncation and security-state inconsistency (bsc#1262803).

## 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 Micro for Rancher 5.3  
    zypper in -t patch SUSE-SLE-Micro-5.3-2026-2259=1

  * SUSE Linux Enterprise Micro 5.3  
    zypper in -t patch SUSE-SLE-Micro-5.3-2026-2259=1

  * openSUSE Leap 15.4  
    zypper in -t patch SUSE-2026-2259=1

  * SUSE Linux Enterprise Micro for Rancher 5.4  
    zypper in -t patch SUSE-SLE-Micro-5.4-2026-2259=1

  * SUSE Linux Enterprise Micro 5.4  
    zypper in -t patch SUSE-SLE-Micro-5.4-2026-2259=1

  * SUSE Linux Enterprise Micro 5.5  
    zypper in -t patch SUSE-SLE-Micro-5.5-2026-2259=1

  * Basesystem Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-2259=1

## Package List:

  * SUSE Linux Enterprise Micro for Rancher 5.3 (noarch)
    * python3-pyOpenSSL-21.0.0-150400.13.1
  * SUSE Linux Enterprise Micro 5.3 (noarch)
    * python3-pyOpenSSL-21.0.0-150400.13.1
  * openSUSE Leap 15.4 (noarch)
    * python3-pyOpenSSL-21.0.0-150400.13.1
  * SUSE Linux Enterprise Micro for Rancher 5.4 (noarch)
    * python3-pyOpenSSL-21.0.0-150400.13.1
  * SUSE Linux Enterprise Micro 5.4 (noarch)
    * python3-pyOpenSSL-21.0.0-150400.13.1
  * SUSE Linux Enterprise Micro 5.5 (noarch)
    * python3-pyOpenSSL-21.0.0-150400.13.1
  * Basesystem Module 15-SP7 (noarch)
    * python3-pyOpenSSL-21.0.0-150400.13.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-40475.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1262803

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