{"cve":"CVE-2026-53666","nvd":{"published":"2026-07-27T22:17:30.937","modified":"2026-10-24T13:10:00.147","status":"Analyzed","description":"React Router is a router for React. In versions 6.4.0 through 7.17.0, if application code was written in a way that allows attacker-supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for an attacker to trigger unexpected constructor execution on the client, which would in turn trigger an outbound network request. This is only possible with very specific (and unlikely) application-layer code. Note that this does not impact an application if it is using Declarative Mode. It only impacts Framework Mode and Data Mode applications that perform manual SSR/hydration. This issue has been fixed in version 7.18.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-470"],"references":["https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180","https://github.com/remix-run/react-router/commit/9d22943fd46c8ae4b08236425fa3549e10e9ad1a","https://github.com/remix-run/react-router/pull/15175","https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0","https://github.com/remix-run/react-router/security/advisories/GHSA-337j-9hxr-rhxg"],"products":["shopify:react-router"],"source":"nvd","synced_at":"2026-10-24T16:53:27.712498749+00:00"},"epss":{"cve":"CVE-2026-53666","score":0.0042,"percentile":0.36081,"date":"2026-10-25"},"kev":null,"osv":[{"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","modified":"2026-09-10T03:50:51.309163082Z","packages":[{"ecosystem":"npm","name":"react-router","purl":"pkg:npm/react-router","ranges":[">=6.4.0 <7.18.0"],"fixed":["7.18.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}