## Critical RCE Vulnerability in React Server Components Exposes Next.js Applications to Remote Code Execution
A critical remote code execution vulnerability has been identified in React Server Components, with documented impact on the movieflex project hosted on Vercel. The flaw stems from insecure deserialization within the React Flight protocol, enabling unauthenticated attackers to execute arbitrary code on affected servers. Security advisories have been published across multiple platforms, including GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React Advisory CVE-2025-55182, and Next.js Advisory CVE-2025-66478, signaling coordinated disclosure efforts between React, Next.js, and Vercel security teams.

The vulnerability was discovered in an active deployment, making it a confirmed attack surface rather than a theoretical risk. Vercel responded by generating an automated pull request to patch the flaw, though the platform acknowledges the effort may not be comprehensive and advises manual review before merging. This approach highlights the complexity of addressing deserialization vulnerabilities, which require careful validation to avoid introducing new issues during remediation.

The exposure raises significant concerns for organizations running React Server Components at scale, particularly those using Next.js on Vercel's infrastructure. Developers are urged to audit their deployments, cross-reference affected configurations against the published CVEs, and apply patches with caution given the automated nature of the current remediation effort. The incident underscores the ongoing challenges of securing server-side rendering architectures against deserialization attacks.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: RCE, CVE-2025-55182, CVE-2025-66478, React Flight, Next.js
- **Credibility**: unverified
- **Published**: 2026-05-14 01:48:29
- **ID**: 82851
- **URL**: https://whisperx.ai/en/intel/82851