## Critical RCE Vulnerability in React Server Components Exposes Next.js and Other Frameworks
A critical remote code execution (RCE) vulnerability has been identified within React Server Components, directly impacting major frameworks like Next.js. The flaw, stemming from insecure deserialization in the React Flight protocol, enables unauthenticated attackers to execute arbitrary code on the server. This is not a theoretical risk; the vulnerability was discovered in the real-world project `cookie-krunch`, underscoring its immediate exploitability.

The security issue is being tracked under multiple official advisories, including GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React's CVE-2025-55182, and Next.js's CVE-2025-66478. Vercel has initiated automated patching efforts, generating pull requests to upgrade vulnerable dependencies. However, the company explicitly warns that its automated fix cannot be guaranteed as comprehensive and may contain mistakes, urging developers to conduct thorough reviews before merging changes.

This vulnerability places thousands of production applications built with React Server Components at severe risk. The core exposure lies in the server-side deserialization process, a fundamental part of the component data protocol. While patches are being rolled out, the onus is on development teams to urgently validate and apply fixes. The incident triggers intense scrutiny on the security of emerging full-stack React architectures and the responsibility of framework maintainers in securing foundational data serialization mechanisms.
---
- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: React, Next.js, Security, Vulnerability, RCE
- **Credibility**: unverified
- **Published**: 2026-03-27 05:27:07
- **ID**: 36874
- **URL**: https://whisperx.ai/en/intel/36874