## Critical RCE Vulnerability in React Server Components Exposes Next.js Deployments to Unauthenticated Server Attacks
A critical remote code execution vulnerability in React Server Components has been identified, posing a severe security risk to applications built on Next.js and related frameworks. The flaw enables unauthenticated attackers to execute arbitrary code on vulnerable servers through insecure deserialization within the React Flight protocol. Security advisories have been issued across multiple tracking systems, including GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React Advisory CVE-2025-55182, and Next.js Advisory CVE-2025-66478.

The vulnerability specifically targets the React Flight protocol, a mechanism used for server-to-client data transmission in React Server Components. Vercel has generated an automated pull request to assist with patching efforts, though the company cautions that the automated fix may not be comprehensive and could contain errors. Developers are strongly advised to carefully review Vercel's guidance before merging any changes into production environments.

The exposure raises significant concerns for organizations relying on React Server Components in production deployments. The ability to achieve unauthenticated RCE represents one of the most severe classes of vulnerabilities, potentially allowing attackers to compromise entire server infrastructure, access sensitive data, or establish persistent access. Security teams should prioritize patching, conduct thorough impact assessments, and monitor for indicators of exploitation given the critical severity and broad framework impact.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: react, next.js, rce, cve, security
- **Credibility**: unverified
- **Published**: 2026-05-05 13:31:38
- **ID**: 79473
- **URL**: https://whisperx.ai/en/intel/79473