{"action":"Upgrade werkzeug to 3.1.4 or later.","affected":[{"fixed":"3.1.4","introduced":"0"}],"component":"werkzeug","cve_ids":["CVE-2025-66221"],"ecosystem":"PyPI","epss":0.00511,"exploited":false,"fixed_versions":["3.1.4"],"ghsa_id":"GHSA-hgf8-39gv-g3f2","id":"tcs_01M5KFKK970XBKM74WP8TR0CCS","modified_at":"2026-09-10T03:50:31.900494607Z","published_at":"2025-12-02T00:27:38Z","references":["https://osv.dev/vulnerability/GHSA-hgf8-39gv-g3f2","https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2","https://nvd.nist.gov/vuln/detail/CVE-2025-66221","https://github.com/pallets/werkzeug/commit/4b833376a45c323a189cd11d2362bcffdb1c0c13","https://github.com/pallets/werkzeug","https://github.com/pallets/werkzeug/releases/tag/3.1.4"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-hgf8-39gv-g3f2","url":"https://osv.dev/vulnerability/GHSA-hgf8-39gv-g3f2"},{"source":"nvd","source_id":"CVE-2025-66221","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66221"}],"summary":"Werkzeug safe_join() allows Windows special device names"}