## Critical RCE Vulnerability in React Server Components Exposes Next.js Deployments to Unauthenticated Attacks
A critical remote code execution vulnerability has been identified in React Server Components, posing a significant threat to applications built on frameworks including Next.js. The flaw enables unauthenticated attackers to execute arbitrary code on affected servers by exploiting insecure deserialization within the React Flight protocol. The vulnerability is tracked under GitHub Security Advisory GHSA-9qr9-h5gf-34mp, with dedicated advisories published by both the React team (CVE-2025-55182) and Next.js (CVE-2025-66478).

The vulnerability emerged through security analysis of the open-source project infinity-wears, hosted on Vercel's platform. Security researchers determined that the attack surface exists specifically within how React Server Components handle serialized data during client-server communication. The React Flight protocol, which manages the transmission of component data between server and client environments, contains the deserialization weakness that allows remote execution without authentication credentials. Vercel has automatically generated pull requests targeting the affected project to facilitate patching efforts, though the company cautions that automated fixes may not be comprehensive and require manual review before deployment.

The exposure carries particular weight given the widespread adoption of Next.js and React Server Components across production environments. Organizations running affected versions face risk of complete server compromise through carefully crafted requests that exploit the deserialization vector. Security teams are advised to review the official React and Next.js advisories for version-specific remediation guidance, apply patches promptly, and audit deployments for unusual activity that might indicate exploitation attempts. The incident underscores ongoing challenges in securing the increasingly complex client-server boundary that modern React frameworks rely upon.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: RCE, CVE-2025-55182, CVE-2025-66478, Next.js, React
- **Credibility**: unverified
- **Published**: 2026-05-04 13:54:09
- **ID**: 79273
- **URL**: https://whisperx.ai/en/intel/79273