Security update for python-Authlib SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2025:3754-1 Final 1 1 2025-10-23T10:27:00Z current 2025-10-23T10:27:00Z 2025-10-23T10:27:00Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for python-Authlib This update for python-Authlib fixes the following issues: - CVE-2025-61920: limited the size of the header to prevent DoS (bsc#1251921). The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-2025-3754,SUSE-SLE-Module-Python3-15-SP6-2025-3754,SUSE-SLE-Module-Python3-15-SP7-2025-3754,openSUSE-SLE-15.6-2025-3754 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2025/suse-su-20253754-1/ Link for SUSE-SU-2025:3754-1 https://lists.suse.com/pipermail/sle-security-updates/2025-October/022984.html E-Mail link for SUSE-SU-2025:3754-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1251921 SUSE Bug 1251921 https://www.suse.com/security/cve/CVE-2025-61920/ SUSE CVE CVE-2025-61920 page SUSE Linux Enterprise Module for Python 3 15 SP6 SUSE Linux Enterprise Module for Python 3 15 SP7 openSUSE Leap 15.6 python311-Authlib-1.3.1-150600.3.6.1 python311-Authlib-1.3.1-150600.3.6.1 as a component of SUSE Linux Enterprise Module for Python 3 15 SP6 python311-Authlib-1.3.1-150600.3.6.1 as a component of SUSE Linux Enterprise Module for Python 3 15 SP7 python311-Authlib-1.3.1-150600.3.6.1 as a component of openSUSE Leap 15.6 Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib's JOSE implementation accepts unbounded JWS/JWT header and signature segments. A remote attacker can craft a token whose base64url-encoded header or signature spans hundreds of megabytes. During verification, Authlib decodes and parses the full input before it is rejected, driving CPU and memory consumption to hostile levels and enabling denial of service. Version 1.6.5 patches the issue. Some temporary workarounds are available. Enforce input size limits before handing tokens to Authlib and/or use application-level throttling to reduce amplification risk. CVE-2025-61920 SUSE Linux Enterprise Module for Python 3 15 SP6:python311-Authlib-1.3.1-150600.3.6.1 SUSE Linux Enterprise Module for Python 3 15 SP7:python311-Authlib-1.3.1-150600.3.6.1 openSUSE Leap 15.6:python311-Authlib-1.3.1-150600.3.6.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-20253754-1/ https://www.suse.com/security/cve/CVE-2025-61920.html CVE-2025-61920 https://bugzilla.suse.com/1251921 SUSE Bug 1251921