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7.5 High

CVE-2025-31137 React Router is a multi-strategy router for React bridging the gap from React 18 to React 19

Description

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.

Affected products and versions

Product Affected versions Fixed in
react-router 7.0 7.0.0 → < 7.4.1 7.4.1
react-router 2.11 2.11.1 → < 2.16.3 2.16.3

References

Timeline

  1. Published
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