{"id":"CVE-2026-42342","aliases":["GHSA-8x6r-g9mw-2r78"],"url":"https://o3.security/vulnerability/CVE-2026-42342","summary":"React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint","details":"React Router is a router for React. In versions 7.0.0 through 7.14.x of react-router and versions 2.10.0 through 2.17.4 of @remix-run/server-runtime, certain crafted requests can consume disproportionate server resources via unbounded path expansion in the __manifest endpoint, resulting in response time degradation and/or service unavailability for end users. This affects React Router Framework Mode applications as well as Remix applications. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in react-router version 7.15.0 and @remix-run/server-runtime version 2.17.5.","published":"2026-06-02T18:23:02.765Z","modified":"2026-08-12T03:51:40.531214608Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00299,"percentile":0.22181,"asOf":"2026-08-09"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"react-router","fixedVersion":"7.15.0"},{"ecosystem":"npm","name":"@remix-run/server-runtime","fixedVersion":"2.17.5"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42342.json"},{"type":"ADVISORY","url":"https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42342"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:40.531214608Z"}}