## Critical RCE Vulnerability in React Server Components Exposes Next.js Deployments to Server-Side Attacks
A critical remote code execution vulnerability has been identified in React Server Components, affecting server-side deployments built with frameworks including Next.js. The flaw stems from insecure deserialization within the React Flight protocol, the mechanism responsible for transmitting server component data between backend and frontend layers. This vulnerability enables unauthenticated attackers to execute arbitrary code on affected servers without requiring credentials or user interaction.

The exposure was discovered in the production project sensei-ai-career-coach, operated on Vercel's platform. Three separate security advisories now track the vulnerability: GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React advisory CVE-2025-55182, and Next.js advisory CVE-2025-66478. Vercel has automatically generated a pull request to address the flaw, though the company cautions the patch may not be comprehensive and could contain errors. Users are advised to consult additional guidance before merging the changes into production environments.

The vulnerability raises significant risk for organizations running React Server Components in production. Frameworks relying on the React Flight protocol for server-side rendering and data streaming remain potentially exposed until patches are properly validated and deployed. Security teams should prioritize review of affected deployments, cross-reference the published advisories, and ensure that automated patches undergo thorough testing before application. The incomplete nature of the auto-generated fix signals that manual security review remains essential rather than assumed complete.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: react, server-components, rce, next.js, cve
- **Credibility**: unverified
- **Published**: 2026-05-03 09:54:08
- **ID**: 79101
- **URL**: https://whisperx.ai/en/intel/79101