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Here i want to share about my write-up for the room React2Shell: CVE-2025–55182 ↗ , explore the CVE-2025–55182 vulnerability in React server components. I wrote this in 2025 and hope it is useful for learning about cybersecurity.
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Task 1: Introduction
This task introduces CVE-2025–55182, dubbed “React2Shell,” a critical vulnerability (CVSS 10.0) affecting React Server Components (RSC) and frameworks like Next.js. The flaw allows unauthenticated remote code execution via a specific HTTP request due to an unsafe deserialization issue. To mitigate this, users must update vulnerable packages (like react-server-dom-webpack) to patched versions (e.g., 19.0.1+).
Having outlined the basics, let’s now dive into the key technical notes.
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Task 2: Understanding React Server Components and the Flight Protocol
This section explains the architecture of React Server Components (RSC), where components are rendered on the server for performance. The server-client communication relies on the React Flight protocol, which handles data serialization using specific markers like $@ (for chunk references)…