{"answers":{"affected":"3 open source packages ship an affected version, including authlib. It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-61920 in the wild and no public exploit code.","fix":"Upgrade authlib to 1.6.5 or later.","what":"CVE-2025-61920 is a high-severity denial of service vulnerability in authlib, published on 10 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-61920 and fix it if it is affected.\n\nWhat it is: CVE-2025-61920 is a high-severity denial of service vulnerability in authlib, published on 10 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-61920 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- authlib (PyPI): affected all versions; fixed in 1.6.5\n- authlib (PyPI): affected all versions; fixed in 1.6.5\n- authlib (PyPI): affected all versions; fixed in 1.6.5\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2025-61920/ (Markdown: https://insights.sbomify.com/CVE-2025-61920/index.md)","id":"CVE-2025-61920","markdown":"https://insights.sbomify.com/CVE-2025-61920/index.md","name":"CVE-2025-61920","record":{"aliases":["DEBIAN-CVE-2025-61920","ECHO-9171-850d-97d8","GHSA-pq5p-34cr-23v9","PYSEC-2026-1203","ROOT-APP-PYPI-CVE-2025-61920","SUSE-SU-2025:3754-1","UBUNTU-CVE-2025-61920","openSUSE-SU-2025:15629-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python OAuth library","requires_auth":"none","summary":"Remote attackers can cause denial of service in Authlib by sending oversized JOSE segments, exhausting CPU and memory resources.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"authlib","vendor":"authlib"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"},{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"},{"id":"CWE-20","name":"Improper Input Validation"}],"description":"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.","ecosystems":["PyPI","SUSE:Linux Enterprise Module for Python 3 15 SP6","SUSE:Linux Enterprise Module for Python 3 15 SP7","openSUSE:Leap 15.6","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Authlib is vulnerable to Denial of Service via Oversized JOSE Segments","id":"CVE-2025-61920","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2025"},"n_packages":7,"n_references":2,"next":{"headline":"Sinatra has ReDoS vulnerability in ETag header value generation","id":"CVE-2025-61921"},"packages":[{"ecosystem":"PyPI","fixed":["1.6.5"],"introduced":["0"],"last_affected":[],"package":"authlib","purl":null,"source":"GHSA-pq5p-34cr-23v9"},{"ecosystem":"PyPI","fixed":["1.6.5"],"introduced":["0"],"last_affected":[],"package":"authlib","purl":"pkg:pypi/authlib","source":"GHSA-pq5p-34cr-23v9"},{"ecosystem":"PyPI","fixed":["1.6.5"],"introduced":["0"],"last_affected":[],"package":"authlib","purl":"pkg:pypi/authlib","source":"PYSEC-2026-1203"},{"ecosystem":"SUSE:Linux Enterprise Module for Python 3 15 SP6","fixed":["1.3.1-150600.3.6.1"],"introduced":["0"],"last_affected":[],"package":"python-Authlib","purl":"pkg:rpm/suse/python-Authlib\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%203%2015%20SP6","source":"SUSE-SU-2025:3754-1"},{"ecosystem":"SUSE:Linux Enterprise Module for Python 3 15 SP7","fixed":["1.3.1-150600.3.6.1"],"introduced":["0"],"last_affected":[],"package":"python-Authlib","purl":"pkg:rpm/suse/python-Authlib\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%203%2015%20SP7","source":"SUSE-SU-2025:3754-1"},{"ecosystem":"openSUSE:Leap 15.6","fixed":["1.3.1-150600.3.6.1"],"introduced":["0"],"last_affected":[],"package":"python-Authlib","purl":"pkg:rpm/opensuse/python-Authlib\u0026distro=openSUSE%20Leap%2015.6","source":"SUSE-SU-2025:3754-1"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["1.6.5-1.1"],"introduced":["0"],"last_affected":[],"package":"python-Authlib","purl":"pkg:rpm/opensuse/python-Authlib\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2025:15629-1"}],"prev":{"headline":"Rack is vulnerable to a memory-exhaustion DoS through unbounded URL-encoded body parsing","id":"CVE-2025-61919"},"products":["authlib"],"published":"2025-10-10","related":[{"cvss_score":9.1,"headline":"Authlib JWS JWK Header Injection: Signature Verification Bypass","id":"CVE-2026-27962","kev_date_added":null,"published":"2026-03-16"},{"cvss_score":8.3,"headline":"Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Oracle","id":"CVE-2026-28490","kev_date_added":null,"published":"2026-03-16"},{"cvss_score":8.2,"headline":"Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding","id":"CVE-2026-28498","kev_date_added":null,"published":"2026-03-16"},{"cvss_score":7.7,"headline":"Authlib: Setting `alg: none` and a blank signature appears to bypass signature verification","id":"CVE-2026-28802","kev_date_added":null,"published":"2026-03-06"},{"cvss_score":7.5,"headline":"Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)","id":"CVE-2025-59420","kev_date_added":null,"published":"2025-09-22"},{"cvss_score":7.5,"headline":"Authlib has algorithm confusion with asymmetric public keys","id":"CVE-2024-37568","kev_date_added":null,"published":"2024-06-09"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-11-03","vendors":["authlib"]},"summary":"Remote attackers can cause denial of service in Authlib by sending oversized JOSE segments, exhausting CPU and memory resources.","url":"https://insights.sbomify.com/CVE-2025-61920/"}