CVE-2026-42342 — React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
remix-run / react-router	affected >= 7.0.0, < 7.15.0
remix-run / @remix-run/server-runtime	affected >= 2.10.0, < 2.17.5

CWE

CWE-400

References

https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.