## Critical RCE Vulnerability in React Server Components Exposes Next.js and Vercel Ecosystems
A critical remote code execution (RCE) vulnerability has been identified within React Server Components, directly impacting major frameworks like Next.js and the broader Vercel ecosystem. The flaw, stemming from insecure deserialization in the React Flight protocol, enables unauthenticated attackers to execute arbitrary code on the server, posing a severe threat to applications built with these technologies.

The vulnerability was discovered in the project 'ai-github-saa-s-application' and is now formally tracked under multiple advisories: GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React's CVE-2025-55182, and Next.js's CVE-2025-66478. This multi-source tracking underscores the widespread nature of the issue across the React and Next.js dependency chains. Vercel has initiated automated patching efforts, issuing a pull request to affected projects, but explicitly warns that its automated fix may not be comprehensive and could contain errors, urging manual review.

The discovery places immediate pressure on thousands of development teams using React Server Components in production. The risk extends beyond individual applications to the integrity of the server-side rendering infrastructure powering a significant portion of modern web applications. While patches are being distributed, the window for exploitation remains open for any unpatched or misconfigured deployments, demanding urgent scrutiny and action from security and engineering leads across the industry.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: React, Security, Vulnerability, Next.js, RCE
- **Credibility**: unverified
- **Published**: 2026-03-27 14:27:34
- **ID**: 37849
- **URL**: https://whisperx.ai/en/intel/37849