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The vulnerability in React Server Components stems from insecure deserialization within the server-side rendering pipeline. When server components receive serialized props or state from the client, a flaw in the deserialization process allows embedded JavaScript code to be evaluated directly on the server. This occurs because the affected versions do not properly validate or sanitize input during the hydration and rendering phases. An attacker can craft a malicious network request containing a payload with executable code, targeting endpoints that utilize React Server Components. Since the vulnerability is unauthenticated, no prior authentication is required, making any exposed server component endpoint a potential entry point. The malicious code is then deserialized and executed in the server environment, leading to full remote code execution. This compromises the underlying server, allowing data theft, service disruption, or lateral movement within the network. The issue is specific to the serialization mechanism used for transmitting component data between client and server in versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0. The patched versions rectify this by implementing secure serialization protocols and rigorous input validation to prevent code injection.
Platform: React
Version: 19.0 19.1.0-1 19.2.0
Vulnerability: Remote Code Execution
Severity: Critical
date: Dec 3 2025
Prediction: Patched Dec 3 2025
What Undercode Say:
Analytics:
bash: npm list react
bash: grep -r “use server” src/
code: import { renderToPipeableStream } from ‘react-dom/server’;
How Exploit:
curl -X POST -H “Content-Type: application/json” -d ‘{“malicious”: “payload”}’ http://target/server-component
Protection from this CVE:
Upgrade react package
Disable server components
Input validation middleware
Impact:
Unauthenticated RCE
Server compromise
Data breach
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Sources:
Reported By: github.com
Extra Source Hub:
Undercode
