GitHub Advisoryadvisory · npm
GHSA-8x6r-g9mw-2r78 React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
HIGH
Official page ↗
- Aliases
- CVE-2026-42342
- Ecosystem
- npm
- Packages
- react-router, @remix-run/server-runtime
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-400
- Reviewed
- 2026-06-03
Affected packages
• npm react-router: >= 7.0.0, < 7.15.0 → fixed in 7.15.0
• npm @remix-run/server-runtime: >= 2.10.0, < 2.17.5 → fixed in 2.17.5
Description
There exists a potential DOS attack vector in React Router Framework Mode applications (as well as Remix v2.10.0 - 2.17.4). Certain requests can be crafted to consume disproportionate resources on the server, resulting in response time degredation and/or service unavailability for end users.
> [!NOTE]
> This does not impact your React Router application if you are using Declarative Mode (``) or Data Mode (`createBrowserRouter`/``).
Related
Alias · CVE (1)
- CVE-2026-42342 React Router is a router for React. vulnerability
Weakness · CWE (1)
- CWE-400 Uncontrolled Resource Consumption weakness