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6.1 Medium

CVE-2026-53666 React Router is a router for React

Description

React Router is a router for React. In versions 6.4.0 through 7.17.0, if application code was written in a way that allows attacker-supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for an attacker to trigger unexpected constructor execution on the client, which would in turn trigger an outbound network request. This is only possible with very specific (and unlikely) application-layer code. Note that this does not impact an application if it is using Declarative Mode. It only impacts Framework Mode and Data Mode applications that perform manual SSR/hydration. This issue has been fixed in version 7.18.0.

Affected products and versions

Product Affected versions Fixed in
react-router 6.4 6.4.0 → < 7.18.0 7.18.0

References

Timeline

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Other CVEs of react-router

The 21 CVEs of react-router →
CVE-2026-53669 React Router is a router for React 5.1 Medium CVE-2026-55685 React Router is a router for React 8.7 High CVE-2026-53668 React Router is a router for React 6.9 Medium CVE-2026-53667 React Router is a router for React 6.9 Medium
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