## Critical RCE Vulnerability in React Server Components Exposes Next.js Deployments via Insecure Deserialization
A critical remote code execution vulnerability has been identified in React Server Components, enabling unauthenticated attackers to execute arbitrary code on affected servers. The flaw resides in insecure deserialization within the React Flight protocol, a mechanism used by server components to stream data between server and client. This security weakness creates a direct path for remote compromise without requiring any authentication or user interaction.

The vulnerability specifically impacts projects built on frameworks that leverage React Server Components, with Next.js among the most prominently affected ecosystems. According to documentation associated with this issue, the project "convert-comparison-widget" hosted on Vercel's platform was identified as carrying the vulnerable implementation. Security advisories tracking the flaw include GitHub Security Advisory GHSA-9qr9-h5gf-34mp, alongside dedicated React advisory CVE-2025-55182 and Next.js advisory CVE-2025-66478. Vercel has automatically generated pull requests to assist with patching, though the company cautions that these automated fixes may not be comprehensive and should be reviewed before merging.

Organizations running Next.js deployments or other React Server Component-based frameworks face immediate exposure if unpatched. The availability of detailed technical advisories and proof-of-concept attack vectors likely lowers the barrier for exploitation. Development teams are urged to audit their dependency trees, prioritize application of official patches, and implement additional input validation layers as a precautionary measure while reviewing Vercel's guidance documentation.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: react, nextjs, vercel, rce, deserialization
- **Credibility**: unverified
- **Published**: 2026-05-05 03:31:38
- **ID**: 79382
- **URL**: https://whisperx.ai/en/intel/79382