GitHub Advisoryadvisory · npm
GHSA-chx6-hx7r-mcp5 React Router: Unauthenticated Denial of Service via Inefficient Route Matching
HIGH
Official page ↗
- Aliases
- CVE-2026-55685
- Ecosystem
- npm
- Packages
- react-router
- Severity
- High
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- Weaknesses
- CWE-400, CWE-407
- Reviewed
- 2026-07-24
Affected packages
• npm react-router: >= 7.0.0, < 7.18.0 → fixed in 7.18.0
Description
This is a follow up to https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78 that covers additional reported scenarios in which the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times.
> [!NOTE]
> This only impacts Framework Mode applications. This does not impact your application if you are using Declarative or Data Mode.
Related
Alias · CVE (1)
- CVE-2026-55685 React Router is a router for React. vulnerability
References
- https://github.com/remix-run/react-router/security/advisories/GHSA-chx6-hx7r-mcp5 web
- https://github.com/remix-run/react-router/pull/15186 web
- https://github.com/remix-run/react-router/commit/09e6020d1950e54f361f7ad00938ecd4dde60929 web
- https://github.com/remix-run/react-router package
- https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180 web
- https://github.com/remix-run/react-router/releases/tag/[email protected] web