CVE-2026-55685: DoS

Description

React Router is a router for React. In versions 7.0.0 through 7.17.0, the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times. This issue is a follow up to CVE-2026-42342, and does not does not impact React Router applications using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>). This issue has been fixed in version 7.18.0.

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Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-407 CWE-407

References

Other References

https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180 https://github.com/remix-run/react-router/commit/09e6020d1950e54f361f7ad00938ecd4dde60929 https://github.com/remix-run/react-router/pull/15186 https://github.com/remix-run/react-router/releases/tag/[email protected] https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78 https://github.com/remix-run/react-router/security/advisories/GHSA-chx6-hx7r-mcp5

Frequently Asked Questions

What is CVE-2026-55685? +

React Router is a router for React. In versions 7.0.0 through 7.17.0, the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times. This issue is a follow up to CVE-2026-42342, and does not does not impact React Router applications using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>). This issue has been fixed in version 7.18.0.

How do I check if I'm vulnerable to CVE-2026-55685? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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