Critical Remote Code Execution (RCE) Vulnerabilities in React and Next.js
Blog post from Endor Labs
React disclosed several critical vulnerabilities in React Server Components, including CVE-2025-55182, which allows unauthenticated remote code execution via insecure deserialization in the Flight protocol. This vulnerability, carrying a CVSS score of 10.0, affects the default configurations of frameworks like Next.js, exposing applications to significant risks without requiring special conditions for exploitation. To address these issues, React released multiple patches for affected versions of react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack, emphasizing the need for immediate upgrades to prevent potential denial of service (DoS) attacks and source code exposure. The React team's coordinated disclosure process, involving Meta's Bug Bounty program, hosting providers, and open-source projects, highlights the challenges of securing complex protocols and the widespread impact on the React ecosystem. Organizations using React Server Components are advised to upgrade immediately and monitor official channels for further guidance on additional hardening measures.
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