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The React core team has released emergency security updates addressing a critical remote code execution (RCE) vulnerability in React Server Components (RSC). The issue impacts applications using server functions and modern frameworks built on top of React’s RSC architecture.
What Happened
The vulnerability allows attackers to execute arbitrary code on the server through crafted requests targeting server-rendered components. Exploitation does not require authentication, making exposed production deployments high risk.
Affected Systems
- Applications using React Server Components
- Frameworks bundling RSC (notably app-router–based setups)
- Public-facing server function endpoints
Fix Released
React has shipped patched versions across the 19.x release line. Developers are strongly advised to upgrade immediately and redeploy affected services. No configuration-only workaround fully mitigates the risk without updating.
What Developers Should Do
- Upgrade React to the latest patched version
- Audit usage of server components and server actions
- Restrict public access to server endpoints where possible
Failure to patch may result in full server compromise.
Source (official):
React Security Advisory – https://sr-react-dev.vercel.app/blog/2025/12/03/critical-security-vulnerability-in-react-server-components
Arsalan Malik is a passionate Software Engineer and the Founder of Makemychance.com. A proud CDAC-qualified developer, Arsalan specializes in full-stack web development, with expertise in technologies like Node.js, PHP, WordPress, React, and modern CSS frameworks.
He actively shares his knowledge and insights with the developer community on platforms like Dev.to and engages with professionals worldwide through LinkedIn.
Arsalan believes in building real-world projects that not only solve problems but also educate and empower users. His mission is to make technology simple, accessible, and impactful for everyone.
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