GitHub Advisoryadvisory · npm

GHSA-rxv8-25v2-qmq8 React Router vulnerable to Denial of Service via reflected user input in single-fetch

HIGH Published 2026-06-04 Modified 2026-06-04 Official page ↗
Aliases
CVE-2026-34077
Ecosystem
npm
Packages
react-router, turbo-stream
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-770
Reviewed
2026-06-04

Affected packages

• npm react-router: >= 7.0.0, < 7.14.0 → fixed in 7.14.0 • npm turbo-stream: < 3.0.0 → fixed in 3.0.0

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 (``) or Data Mode (`createBrowserRouter`/``).

Related

Alias · CVE (1)

Weakness · CWE (1)

  • CWE-770 Allocation of Resources Without Limits or Throttling weakness

References