{"action":"Upgrade react-router to 7.18.0 or later.","affected":[{"fixed":"7.18.0","introduced":"6.4.0"}],"component":"react-router","cve_ids":["CVE-2026-53666"],"ecosystem":"npm","epss":0.0042,"exploited":false,"fixed_versions":["7.18.0"],"ghsa_id":"GHSA-337j-9hxr-rhxg","id":"tcs_01M5KEVQVHC4RBJ0NM837RQYJT","modified_at":"2026-09-10T03:50:51.309163082Z","published_at":"2026-07-23T19:34:14Z","references":["https://osv.dev/vulnerability/GHSA-337j-9hxr-rhxg","https://github.com/remix-run/react-router/security/advisories/GHSA-337j-9hxr-rhxg","https://github.com/remix-run/react-router/pull/15175","https://github.com/remix-run/react-router/commit/9d22943fd46c8ae4b08236425fa3549e10e9ad1a","https://github.com/remix-run/react-router","https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180","https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0"],"severity":{"label":"medium","score":6.1},"sources":[{"source":"osv","source_id":"GHSA-337j-9hxr-rhxg","url":"https://osv.dev/vulnerability/GHSA-337j-9hxr-rhxg"}],"summary":"React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR Hydration"}