## Critical RCE Vulnerability in React Server Components Exposes Next.js and Related Frameworks to Server-Side Attacks
A critical remote code execution vulnerability has been identified in React Server Components, posing a significant security risk to applications built on Next.js and other compatible frameworks. The flaw enables unauthenticated attackers to execute arbitrary code on the server through insecure deserialization within the React Flight protocol, according to a GitHub security advisory.

The vulnerability, tracked under multiple identifiers including GHSA-9qr9-h5gf-34mp, CVE-2025-55182, and CVE-2025-66478, was discovered in the sile-atelier project hosted on Vercel. The exposure stems from a weakness in how React Server Components handle data serialization during the Flight protocol exchange between server and client. Vercel has automatically generated a pull request to patch the affected project, though the company cautions that the automated fix may not be comprehensive and requires manual review before merging. The React team has published dedicated guidance, and affected developers are urged to consult the linked advisories before deploying any changes to production environments.

Security researchers warn that the vulnerability could have far-reaching implications given the widespread adoption of React Server Components across the ecosystem. Applications relying on Next.js, which heavily utilizes these components for server-side rendering and data fetching, face potential exposure if left unpatched. The insecure deserialization vector is particularly concerning because it allows remote execution without requiring authentication, lowering the barrier for exploitation. Organizations using affected frameworks should prioritize applying patches and implementing additional validation layers until a complete remediation is confirmed. The incident underscores ongoing challenges in securing server-client communication protocols as modern frameworks increasingly shift processing logic between environments.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: cve, rce, react, next.js, vercel
- **Credibility**: unverified
- **Published**: 2026-05-06 07:31:40
- **ID**: 79680
- **URL**: https://whisperx.ai/en/intel/79680