Vulnerability · Published Jun 2, 2026 · Assigned by GitHub_M
CVE-2026-42342React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
High 7.5
In plain English
A high-severity uncontrolled resource consumption in react-router from remix-run. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @remix-run/server-runtime | 2.17.5 | GHSA-8x6r-g9mw-2r78 |
| npm | react-router | 7.15.0 | GHSA-8x6r-g9mw-2r78 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| remix-run | react-router | >= 7.0.0, < 7.15.0 |
| remix-run | @remix-run/server-runtime | >= 2.10.0, < 2.17.5 |
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H