SUSE-SU-2026:0300-1: important: Security update for python-pyasn1

[SLE-SECURITY-UPDATES]

# Security update for python-pyasn1

Announcement ID: SUSE-SU-2026:0300-1  
Release Date: 2026-01-27T06:46:31Z  
Rating: important  
References:

  * bsc#1256902

  
Cross-References:

  * CVE-2026-23490

  
CVSS scores:

  * CVE-2026-23490 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-23490 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

  
Affected Products:

  * SUSE Linux Enterprise High Performance Computing 12 SP5
  * 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 SP5

  
  
An update that solves one vulnerability can now be installed.

## Description:

This update for python-pyasn1 fixes the following issues:

  * CVE-2026-23490: Fixed malformed RELATIVE-OID with excessive continuation
    octets leading to Denial of Service (bsc#1256902)

## 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 12 SP5 LTSS  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-2026-300=1

  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security  
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-300=1

## Package List:

  * SUSE Linux Enterprise Server 12 SP5 LTSS (noarch)
    * python-pyasn1-0.1.9-4.11.1
    * python3-pyasn1-0.1.9-4.11.1
  * SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security (noarch)
    * python-pyasn1-0.1.9-4.11.1
    * python3-pyasn1-0.1.9-4.11.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-23490.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1256902

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