{"document":{"aggregate_severity":{"namespace":"https://www.suse.com/support/security/rating/","text":"important"},"category":"csaf_security_advisory","csaf_version":"2.0","distribution":{"text":"Copyright 2024 SUSE LLC. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"summary","text":"Security update for python-Authlib","title":"Title of the patch"},{"category":"description","text":"This update for python-Authlib fixes the following issues:\n\n- CVE-2025-61920: limited the size of the header to prevent DoS (bsc#1251921).\n","title":"Description of the patch"},{"category":"details","text":"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","title":"Patchnames"},{"category":"legal_disclaimer","text":"CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).","title":"Terms of use"}],"publisher":{"category":"vendor","contact_details":"https://www.suse.com/support/security/contact/","name":"SUSE Product Security Team","namespace":"https://www.suse.com/"},"references":[{"category":"external","summary":"SUSE ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"self","summary":"URL of this CSAF notice","url":"https://ftp.suse.com/pub/projects/security/csaf/suse-su-2025_3754-1.json"},{"category":"self","summary":"URL for SUSE-SU-2025:3754-1","url":"https://www.suse.com/support/update/announcement/2025/suse-su-20253754-1/"},{"category":"self","summary":"E-Mail link for SUSE-SU-2025:3754-1","url":"https://lists.suse.com/pipermail/sle-security-updates/2025-October/022984.html"},{"category":"self","summary":"SUSE Bug 1251921","url":"https://bugzilla.suse.com/1251921"},{"category":"self","summary":"SUSE CVE CVE-2025-61920 page","url":"https://www.suse.com/security/cve/CVE-2025-61920/"}],"title":"Security update for python-Authlib","tracking":{"current_release_date":"2025-10-23T10:27:00Z","generator":{"date":"2025-10-23T10:27:00Z","engine":{"name":"cve-database.git:bin/generate-csaf.pl","version":"1"}},"id":"SUSE-SU-2025:3754-1","initial_release_date":"2025-10-23T10:27:00Z","revision_history":[{"date":"2025-10-23T10:27:00Z","number":"1","summary":"Current version"}],"status":"final","version":"1"}},"product_tree":{"branches":[{"branches":[{"branches":[{"category":"product_version","name":"python311-Authlib-1.3.1-150600.3.6.1.noarch","product":{"name":"python311-Authlib-1.3.1-150600.3.6.1.noarch","product_id":"python311-Authlib-1.3.1-150600.3.6.1.noarch"}}],"category":"architecture","name":"noarch"},{"branches":[{"category":"product_name","name":"SUSE Linux Enterprise Module for Python 3 15 SP6","product":{"name":"SUSE Linux Enterprise Module for Python 3 15 SP6","product_id":"SUSE Linux Enterprise Module for Python 3 15 SP6","product_identification_helper":{"cpe":"cpe:/o:suse:sle-module-python3:15:sp6"}}},{"category":"product_name","name":"SUSE Linux Enterprise Module for Python 3 15 SP7","product":{"name":"SUSE Linux Enterprise Module for Python 3 15 SP7","product_id":"SUSE Linux Enterprise Module for Python 3 15 SP7","product_identification_helper":{"cpe":"cpe:/o:suse:sle-module-python3:15:sp7"}}},{"category":"product_name","name":"openSUSE Leap 15.6","product":{"name":"openSUSE Leap 15.6","product_id":"openSUSE Leap 15.6","product_identification_helper":{"cpe":"cpe:/o:opensuse:leap:15.6"}}}],"category":"product_family","name":"SUSE Linux Enterprise"}],"category":"vendor","name":"SUSE"}],"relationships":[{"category":"default_component_of","full_product_name":{"name":"python311-Authlib-1.3.1-150600.3.6.1.noarch as component of SUSE Linux Enterprise Module for Python 3 15 SP6","product_id":"SUSE Linux Enterprise Module for Python 3 15 SP6:python311-Authlib-1.3.1-150600.3.6.1.noarch"},"product_reference":"python311-Authlib-1.3.1-150600.3.6.1.noarch","relates_to_product_reference":"SUSE Linux Enterprise Module for Python 3 15 SP6"},{"category":"default_component_of","full_product_name":{"name":"python311-Authlib-1.3.1-150600.3.6.1.noarch as component of SUSE Linux Enterprise Module for Python 3 15 SP7","product_id":"SUSE Linux Enterprise Module for Python 3 15 SP7:python311-Authlib-1.3.1-150600.3.6.1.noarch"},"product_reference":"python311-Authlib-1.3.1-150600.3.6.1.noarch","relates_to_product_reference":"SUSE Linux Enterprise Module for Python 3 15 SP7"},{"category":"default_component_of","full_product_name":{"name":"python311-Authlib-1.3.1-150600.3.6.1.noarch as component of openSUSE Leap 15.6","product_id":"openSUSE Leap 15.6:python311-Authlib-1.3.1-150600.3.6.1.noarch"},"product_reference":"python311-Authlib-1.3.1-150600.3.6.1.noarch","relates_to_product_reference":"openSUSE Leap 15.6"}]},"vulnerabilities":[{"cve":"CVE-2025-61920","ids":[{"system_name":"SUSE CVE Page","text":"https://www.suse.com/security/cve/CVE-2025-61920"}],"notes":[{"category":"general","text":"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.","title":"CVE description"}],"product_status":{"recommended":["SUSE Linux Enterprise Module for Python 3 15 SP6:python311-Authlib-1.3.1-150600.3.6.1.noarch","SUSE Linux Enterprise Module for Python 3 15 SP7:python311-Authlib-1.3.1-150600.3.6.1.noarch","openSUSE Leap 15.6:python311-Authlib-1.3.1-150600.3.6.1.noarch"]},"references":[{"category":"external","summary":"CVE-2025-61920","url":"https://www.suse.com/security/cve/CVE-2025-61920"},{"category":"external","summary":"SUSE Bug 1251921 for CVE-2025-61920","url":"https://bugzilla.suse.com/1251921"}],"remediations":[{"category":"vendor_fix","details":"To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n","product_ids":["SUSE Linux Enterprise Module for Python 3 15 SP6:python311-Authlib-1.3.1-150600.3.6.1.noarch","SUSE Linux Enterprise Module for Python 3 15 SP7:python311-Authlib-1.3.1-150600.3.6.1.noarch","openSUSE Leap 15.6:python311-Authlib-1.3.1-150600.3.6.1.noarch"]}],"scores":[{"cvss_v3":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"products":["SUSE Linux Enterprise Module for Python 3 15 SP6:python311-Authlib-1.3.1-150600.3.6.1.noarch","SUSE Linux Enterprise Module for Python 3 15 SP7:python311-Authlib-1.3.1-150600.3.6.1.noarch","openSUSE Leap 15.6:python311-Authlib-1.3.1-150600.3.6.1.noarch"]}],"threats":[{"category":"impact","date":"2025-10-23T10:27:00Z","details":"important"}],"title":"CVE-2025-61920"}]}