## Critical RCE Vulnerability in React Server Components Exposes Next.js and Vercel Ecosystems to Unauthenticated Server Exploitation
A critical remote code execution vulnerability has been identified in React Server Components, with advisories spanning multiple identifiers including CVE-2025-55182, CVE-2025-66478, and GitHub Security Advisory GHSA-9qr9-h5gf-34mp. The flaw enables unauthenticated RCE on affected servers through insecure deserialization within the React Flight protocol. Vercel has automatically generated pull requests for projects under active development through its platform, though officials cautioned that these automated patches may be incomplete and require manual review before deployment.

The vulnerability was discovered in the project labeled "ajit," hosted on Vercel's developer platform. React Server Components serve as a foundational architecture for modern JavaScript frameworks, particularly Next.js, which powers a significant portion of production web applications globally. The insecure deserialization vector in the React Flight protocol—a mechanism used for streaming component data between server and client—creates a direct path for remote attackers to execute arbitrary code without authentication credentials or user interaction.

Organizations running Next.js deployments or other React Server Component-dependent frameworks face immediate patching pressure. The presence of automated exploitation infrastructure for this class of vulnerability is anticipated given the widespread adoption of affected technologies. Security teams should prioritize reviewing Vercel's automated guidance while conducting independent verification of patch completeness, as the source explicitly warns that automated fixes may contain errors or gaps. The multi-advisory disclosure across React, Next.js, and GitHub Security Lab channels indicates coordinated disclosure efforts, though the full scope of affected applications remains under assessment.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: RCE, CVE, React Server Components, Next.js, deserialization
- **Credibility**: unverified
- **Published**: 2026-04-29 08:54:12
- **ID**: 78142
- **URL**: https://whisperx.ai/en/intel/78142