SUSE-SU-2026:0975-1: critical: Security update for python-Authlib

[SLE-SECURITY-UPDATES]

# Security update for python-Authlib

Announcement ID: SUSE-SU-2026:0975-1  
Release Date: 2026-03-23T16:34:44Z  
Rating: critical  
References:

  * bsc#1259736
  * bsc#1259737
  * bsc#1259738

  
Cross-References:

  * CVE-2026-27962
  * CVE-2026-28490
  * CVE-2026-28498

  
CVSS scores:

  * CVE-2026-27962 ( SUSE ):  9.1
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-27962 ( SUSE ):  9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-27962 ( NVD ):  9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-28490 ( SUSE ):  8.2
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-28490 ( SUSE ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-28490 ( NVD ):  8.3
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-28490 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
  * CVE-2026-28498 ( SUSE ):  9.1
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-28498 ( SUSE ):  9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-28498 ( NVD ):  8.2
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  * CVE-2026-28498 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

  
Affected Products:

  * openSUSE Leap 15.6
  * Python 3 Module 15-SP7
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Server 15 SP6
  * SUSE Linux Enterprise Server 15 SP6 LTSS
  * SUSE Linux Enterprise Server 15 SP7
  * SUSE Linux Enterprise Server for SAP Applications 15 SP6
  * SUSE Linux Enterprise Server for SAP Applications 15 SP7

  
  
An update that solves three vulnerabilities can now be installed.

## Description:

This update for python-Authlib fixes the following issues:

  * CVE-2026-27962: JWS `deserialize_compact()` allows for signature bypass by
    accepting user-controlled embedded JWK as verification key (bsc#1259738).
  * CVE-2026-28490: cryptographic padding oracle in JWE RSA1_5 key management
    algorithm (bsc#1259736).
  * CVE-2026-28498: fail-open in behavior OIDC hash validation allows for bypass
    mandatory integrity protections (bsc#1259737).

## 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:

  * openSUSE Leap 15.6  
    zypper in -t patch SUSE-2026-975=1 openSUSE-SLE-15.6-2026-975=1

  * Python 3 Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Python3-15-SP7-2026-975=1

  * SUSE Linux Enterprise Server 15 SP6 LTSS  
    zypper in -t patch SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-975=1

  * SUSE Linux Enterprise Server for SAP Applications 15 SP6  
    zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP6-2026-975=1

## Package List:

  * openSUSE Leap 15.6 (noarch)
    * python311-Authlib-1.3.1-150600.3.17.1
  * Python 3 Module 15-SP7 (noarch)
    * python311-Authlib-1.3.1-150600.3.17.1
  * SUSE Linux Enterprise Server 15 SP6 LTSS (noarch)
    * python311-Authlib-1.3.1-150600.3.17.1
  * SUSE Linux Enterprise Server for SAP Applications 15 SP6 (noarch)
    * python311-Authlib-1.3.1-150600.3.17.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-27962.html
  * https://www.suse.com/security/cve/CVE-2026-28490.html
  * https://www.suse.com/security/cve/CVE-2026-28498.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1259736
  * https://bugzilla.suse.com/show_bug.cgi?id=1259737
  * https://bugzilla.suse.com/show_bug.cgi?id=1259738

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