remix-run/react-router · Security
React Router vulnerable to Denial of Service via reflected user input in single-fetch
- GHSA ID
- GHSA-rxv8-25v2-qmq8
- CVE ID
- CVE-2026-34077
- Severity
- high
- Published
- Updated
- CVSS
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS v3
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
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>).
CWEs
- CWE-770 · Allocation of Resources Without Limits or Throttling
References
- https://github.com/remix-run/react-router/security/advisories/GHSA-rxv8-25v2-qmq8 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-34077 ↗
- https://github.com/remix-run/react-router/commit/59811921d3c7d599077b8cadccdcd65a233165e0 ↗
- https://github.com/jacob-ebey/turbo-stream/blob/v2.4.1/src/flatten.ts#L175-L177 ↗
- https://github.com/jacob-ebey/turbo-stream/blob/v2.4.1/src/unflatten.ts#L185-L189 ↗
- https://github.com/advisories/GHSA-rxv8-25v2-qmq8 ↗