CVE-2026-34077

React Router vulnerable to Denial of Service via reflected user input in single-fetch

State: Published
Severity: 7.5 High
Published: Jun 2, 2026
Updated: Jun 3, 2026
Reserved: Mar 25, 2026

Description

React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
react-routerremix-run	>= 7.0.0, < 7.14.0Affected
turbo-streamremix-run	< 3.0.0Affected

References

https://github.com/remix-run/react-router/security/advisories/GHSA-rxv8-25v2-qmq8

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