{"action":"Upgrade werkzeug to 3.1.5 or later.","affected":[{"fixed":"3.1.5","introduced":"0"}],"component":"werkzeug","cve_ids":["CVE-2026-21860"],"ecosystem":"PyPI","epss":0.00475,"exploited":false,"fixed_versions":["3.1.5"],"ghsa_id":"GHSA-87hc-h4r5-73f7","id":"tcs_01M5KF7HRYY4PXTQ3WXGFY1NM6","modified_at":"2026-09-10T03:50:32.862525778Z","published_at":"2026-01-08T19:51:21Z","references":["https://osv.dev/vulnerability/GHSA-87hc-h4r5-73f7","https://github.com/pallets/werkzeug/security/advisories/GHSA-87hc-h4r5-73f7","https://nvd.nist.gov/vuln/detail/CVE-2026-21860","https://github.com/pallets/werkzeug/commit/7ae1d254e04a0c33e241ac1cca4783ce6c875ca3","https://github.com/pallets/werkzeug"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-87hc-h4r5-73f7","url":"https://osv.dev/vulnerability/GHSA-87hc-h4r5-73f7"}],"summary":"Werkzeug safe_join() allows Windows special device names with compound extensions"}