CVE-2026-42342
React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | react-router | >= 7.0.0, < 7.15.0 | 7.15.0 |
| npm | @remix-run/server-runtime | >= 2.10.0, < 2.17.5 | 2.17.5 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Shopify | React-Router | from 7.0.0 before 7.15.0 |
| Shopify | Remix-Run\/Server-Runtime | from 2.10.0 before 2.17.5 |