How to: CVE-2025-31137 (2025-04-01)
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React Router is a multi-strategy router for React bridging the gap from React 18 to React 19. There is a vulnerability in Remix/React Router that affects all Remix 2 and React Router 7 consumers using the Express adapter. Basically, this vulnerability allows anyone to spoof the URL used in an incoming Request by putting a URL pathname in the port section of a URL that is part of a Host or X-Forwarded-Host header sent to a Remix/React Router request handler. This issue has been patched and released in Remix 2.16.3 and React Router 7.4.1.
```
- [pouriam23/vulnerability-in-Remix-React-Router-CVE-2025-31137-](https://github.com/pouriam23/vulnerability-in-Remix-React-Router-CVE-2025-31137-)