High, CVSS 7.5npmAmendedPublished
React Router vulnerable to Denial of Service via reflected user input in single-fetch
CVE-2026-34077 · GHSA-rxv8-25v2-qmq8
- Affected
- npm turbo-stream < 3.0.0
- Fixed in
- 3.0.0· Vendor fix available
- Issue
- A DoS vulnerability exists in the React Router v7 Framework Mode, as well as Remix v2.9.0+ with Single Fetch enabled. In some scenarios the underlying serialization algorithm can become a bottleneck when encoding specific types of data into server responses. Please upgrade to React Router v7.14.0 or later. [!NOTE] This does not impact your React Router application if you are using Declarative Mode (<BrowserRouter) or Data Mode (createBrowserRouter/<RouterProvider).
Recommended action: Upgrade to 3.0.0 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.