Critical RSC Bugs in React and Next.js Enable Unauthenticated Remote Code Execution
A critical security vulnerability has been discovered in React Server Components (RSC) that poses a severe risk to applications using this technology. This flaw, identified as CVE-2025-55182, has been assigned the highest possible severity rating with a CVSS score of 10.0. If exploited, it could allow attackers to execute code remotely without any authentication.
The React Team explained that the vulnerability stems from a weakness in how React processes and decodes payloads sent to React Server Function endpoints. By exploiting this flaw, an attacker can trigger unauthenticated remote code execution, potentially compromising the entire system running React Server Components.
Understanding the Impact of Critical RSC Bugs in React and Next.js
This critical RSC bug affects both React and Next.js frameworks, as both rely on React Server Components for server-side rendering and functionality. The vulnerability allows malicious actors to send specially crafted payloads to React Server Function endpoints. Because React does not properly validate or decode these payloads, attackers can inject and execute arbitrary code on the server.
Such unauthorized remote code execution can lead to severe consequences, including data breaches, system takeover, and disruption of services. Since the exploit requires no authentication, it poses a significant threat to any application using vulnerable versions of React Server Components.
Mitigation and Response to the Critical RSC Bugs in React and Next.js
The React Team has acknowledged the severity of this issue and is actively working on addressing the vulnerability. Developers using React Server Components are advised to monitor official channels for patches and updates that fix this critical security flaw.
Until a fix is released, it is crucial for teams to review their use of React Server Function endpoints and implement any recommended security measures to reduce exposure. Awareness of this critical RSC bug is essential for maintaining the security and integrity of applications built with React and Next.js.
In summary, the discovery of this maximum-severity vulnerability in React Server Components highlights the importance of rigorous security practices in modern web development. The critical RSC bugs in React and Next.js allow unauthenticated remote code execution, making it imperative for developers to act swiftly to protect their applications.
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