CVE-2026-53666 React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR Hydration

React Router is a router for React. In versions 6.4.0 through 7.17.0, if application code was written in a way that allows attacker-supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for an attacker to trigger unexpected constructor execution on...

PT-2026-64212

Name of the Vulnerable Software and Affected Versions React Router versions 6.4.0 through 7.17.0 Description In Framework Mode and Data Mode applications performing manual SSR Server-Side Rendering, a flaw exists where attacker-supplied input can overwrite specific aspects of errors caught during...