CVE-2026-55685
CVE-2026-55685 · React Router: Unauthenticated Denial of Service via Inefficient Route Matching
This page contains facts from public vulnerability sources. Check the original advisory before updating.
React Router is a router for React. In versions 7.0.0 through 7.17.0, the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times. This issue is a follow up to CVE-2026-42342, and does not does not impact React Router applications using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>). This issue has been fixed in version 7.18.0.
CVSS 8.7 · High · EPSS 0.7% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
react-router
- Versions
- >= 7.0.0, < 7.18.0: Affected
No fix published
react-router npm
- Affected ranges
- SEMVER: ≥ 7.0.0, < 7.18.0
Update to 7.18.0
Original sources
- https://github.com/remix-run/react-router/security/advisories/GHSA-chx6-hx7r-mcp5
- https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78
- https://github.com/remix-run/react-router/pull/15186
- https://github.com/remix-run/react-router/commit/09e6020d1950e54f361f7ad00938ecd4dde60929
- https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180
- https://github.com/remix-run/react-router/releases/tag/[email protected]
- https://nvd.nist.gov/vuln/detail/CVE-2026-55685