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Description

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.

PUBLISHED Reserved 2026-04-25 | Published 2026-06-02 | Updated 2026-06-03 | Assigner GitHub_M




HIGH: 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-502: Deserialization of Untrusted Data

Product status

>= 7.0.0, < 7.14.2
affected

References

github.com/...router/security/advisories/GHSA-49rj-9fvp-4h2h

cve.org (CVE-2026-42211)

nvd.nist.gov (CVE-2026-42211)

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