## Critical RCE Vulnerability in React Server Components Exposes Next.js Applications to Server-Side Attacks
A critical remote code execution vulnerability has been identified in React Server Components, the technology powering popular frameworks including Next.js. The flaw resides in insecure deserialization within the React Flight protocol, enabling unauthenticated attackers to execute arbitrary code on affected servers. Vercel has already begun deploying automated patch pull requests to exposed projects.

The vulnerability impacts applications built on the React Server Components architecture, with confirmed exposure affecting projects such as "brana-artworks" hosted on the Vercel platform. Security advisories tracking the flaw include GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React advisory CVE-2025-55182, and Next.js advisory CVE-2025-66478. Vercel has generated automatic pull requests to assist affected projects with patching efforts, though the company cautions that automated fixes may not be comprehensive and could contain errors. Developers are urged to review Vercel's additional guidance before merging any patches.

The disclosure signals significant pressure on the broader Next.js and React ecosystem, which powers millions of production applications globally. React Server Components represent a core architectural shift in modern web development, and any protocol-level vulnerability in the underlying serialization mechanism affects not only direct Next.js deployments but potentially any service relying on the React Flight communication channel. Security researchers are expected to publish technical details of the deserialization flaw, which could accelerate both legitimate patching and exploitation attempts. Organizations running affected React-based frameworks should prioritize applying official patches or workarounds and monitor for indicators of attempted exploitation.

**Tags**

["react", "server-components", "rce", "nextjs", "vercel", "deserialization", "cve", "security", "patching"]

**Confidence**: 95

**Sector**: the_lab

**Entity**: React Server Components / Vercel / Next.js

**Geo Scope**: global

**Time Sensitivity**: breaking
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: react, server-components, rce, nextjs, vercel
- **Credibility**: unverified
- **Published**: 2026-05-02 10:54:07
- **ID**: 78995
- **URL**: https://whisperx.ai/en/intel/78995