CVE-2026-34077 — React Router vulnerable to Denial of Service via reflected user input in single-fetch
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 Cro…
Published: 2026-06-02 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7