{"action":"Upgrade authlib to 1.6.4 or later.","affected":[{"fixed":"1.6.4","introduced":"0"}],"component":"authlib","cve_ids":["CVE-2025-59420"],"ecosystem":"PyPI","epss":0.00262,"exploited":false,"fixed_versions":["1.6.4"],"ghsa_id":"GHSA-9ggr-2464-2j32","id":"tcs_01M5KFAT2XPFFRHZFAXB35708F","modified_at":"2026-09-10T03:50:28.176043463Z","published_at":"2025-09-22T14:42:12Z","references":["https://osv.dev/vulnerability/GHSA-9ggr-2464-2j32","https://github.com/authlib/authlib/security/advisories/GHSA-9ggr-2464-2j32","https://nvd.nist.gov/vuln/detail/CVE-2025-59420","https://github.com/authlib/authlib/commit/6b1813e4392eb7c168c276099ff7783b176479df","https://github.com/authlib/authlib","https://lists.debian.org/debian-lts-announce/2025/10/msg00032.html"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-9ggr-2464-2j32","url":"https://osv.dev/vulnerability/GHSA-9ggr-2464-2j32"}],"summary":"Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass)"}