React Router: Unauthenticated Denial of Service via Inefficient Route Matching
Published 24 Jul 2026 · Updated 10 Sept 2026
Affected package
- Affected
- >=7.0.0 <7.18.0
- Fixed in
- 7.18.0
npm install react-router@7.18.0Details
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.
Is GHSA-chx6-hx7r-mcp5 in any of your client repos?
Checking one package by hand is fine. Checking it across forty client projects is not. NPMscan reads the lockfiles in every GitHub repo you pick, finds each project with an affected react-router, and gives you the command that fixes it.
References
- Linkgithub.com/remix-run/react-router/security/advisories/GHSA-chx6-hx7r-mcp5
- Linkgithub.com/remix-run/react-router/pull/15186
- Linkgithub.com/remix-run/react-router/commit/09e6020d1950e54f361f7ad00938ecd4dde60929
- Packagegithub.com/remix-run/react-router
- Linkgithub.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180
- Linkgithub.com/remix-run/react-router/releases/tag/react-router@7.18.0
Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.