## Critical RCE Vulnerability in React Server Components Exposes Next.js Deployments to Server-Side Attack
A critical remote code execution vulnerability in React Server Components has been identified, posing a severe threat to applications built on frameworks including Next.js. The flaw, rooted in insecure deserialization within the React Flight protocol, allows unauthenticated attackers to execute arbitrary code on affected servers. Vercel has flagged this vulnerability as critical and is actively pushing automated remediation through pull requests to exposed projects.

The vulnerability specifically impacts the project fx-regime-lab-web, hosted on Vercel's infrastructure. Security advisories tracking this flaw include GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React advisory CVE-2025-55182, and Next.js advisory CVE-2025-66478. The attack vector requires no authentication, meaning any exposed endpoint leveraging React Server Components could serve as an entry point for remote compromise. The automated patch generated by Vercel acknowledges potential limitations, warning that the fix may not be comprehensive and urging maintainers to review additional guidance before merging.

Development teams using Next.js or other React Server Component-dependent frameworks should treat this as an immediate patching priority. Organizations running affected deployments on Vercel are advised to audit their current pull request queues for the automated security patches, evaluate the completeness of the provided fix, and consider temporary mitigations such as disabling affected components if a comprehensive patch is unavailable. The disclosure represents a significant supply chain risk given React's ubiquity across modern web infrastructure.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: react, next.js, vercel, rce, cve
- **Credibility**: unverified
- **Published**: 2026-04-26 14:54:08
- **ID**: 77200
- **URL**: https://whisperx.ai/en/intel/77200