{"action":"Upgrade @remix-run/router to 1.23.3 or later.","affected":[{"fixed":"1.23.3","introduced":"1.3.0"}],"component":"@remix-run/router","cve_ids":["CVE-2026-40181"],"ecosystem":"npm","epss":0.00221,"exploited":false,"fixed_versions":["1.23.3"],"ghsa_id":"GHSA-2j2x-hqr9-3h42","id":"tcs_01M5KETA4X564SN2ZEEBEZSB41","modified_at":"2026-09-10T03:50:55.348600076Z","published_at":"2026-06-03T20:58:01Z","references":["https://osv.dev/vulnerability/GHSA-2j2x-hqr9-3h42","https://github.com/remix-run/react-router/security/advisories/GHSA-2j2x-hqr9-3h42","https://nvd.nist.gov/vuln/detail/CVE-2026-40181","https://github.com/remix-run/react-router/commit/d77f6b1","https://github.com/remix-run/react-router"],"severity":{"label":"medium"},"sources":[{"source":"osv","source_id":"GHSA-2j2x-hqr9-3h42#npm/@remix-run/router","url":"https://osv.dev/vulnerability/GHSA-2j2x-hqr9-3h42"}],"summary":"React Router's same-origin redirect with path starting // causes open redirect via protocol-relative URL reinterpretation"}