## Critical RCE Vulnerability in React Server Components Tracked Under Multiple CVEs
A critical remote code execution vulnerability in React Server Components has been identified, posing a significant security risk to applications built with affected frameworks including Next.js. The flaw stems from insecure deserialization within the React Flight protocol, enabling unauthenticated remote code execution on vulnerable servers.

The vulnerability is being tracked across multiple security advisories, including GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React Advisory CVE-2025-55182, and Next.js Advisory CVE-2025-66478. Vercel has generated an automated pull request targeting the affected project pla-cursos to assist with patching efforts, though officials warn the automated fix may not be comprehensive and could contain errors. Users are being urged to review Vercel's guidance before merging any generated changes.

Security researchers are advising organizations using React Server Components to immediately assess their exposure, prioritize patching, and verify their implementations against the published advisories. The vulnerability's presence in the React Flight protocol—a core component of how server-side React renders and transmits data to clients—suggests a broad potential attack surface across any deployment utilizing this architecture. Organizations are encouraged to monitor their deployments for any signs of exploitation attempts and to implement additional security monitoring as the situation develops.
---
- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: cve, rce, security vulnerability, react, next.js
- **Credibility**: unverified
- **Published**: 2026-05-12 21:48:35
- **ID**: 82381
- **URL**: https://whisperx.ai/en/intel/82381