PT-2026-45834 · Remix Run · React Router

Published 2026-06-02 · Updated 2026-06-02 · CVE-2026-42211

Mitre

CVSS v3.1

8.1

High

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

React Router is a router for React. In versions 7.0.0 through 7.14.1, when using Framework Mode, a combination of steps could potentially allow unauthorized remote code execution (RCE) through external requests. This attack requires the application code to have an existing prototype pollution vulnerability, which can then be leveraged in a 2-step attack where the second step triggers unauthorized RCE on the remote server. This does not impact applications using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>). This is patched in version 7.14.2.

Fix

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2026-42211

Affected Products

React Router

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-42211 · Security Note
• https://github.com/remix-run/react-router/security/advisories/GHSA-49rj-9fvp-4h2h · Note