CVE-2026-55685 — React Router: Unauthenticated Denial of Service via Inefficient Route Matching
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 …
Published: 2026-07-27 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7