## Critical RCE Vulnerability in React Server Components Exposes Next.js Applications to Server-Side Attacks
A critical remote code execution vulnerability has been identified in React Server Components, placing applications built on Next.js and related frameworks at significant risk. The flaw stems from insecure deserialization within the React Flight protocol, enabling unauthenticated attackers to execute arbitrary code on affected servers. The vulnerability was discovered in the Vercel-hosted project section8-market-scout and has prompted an automated patch pull request generated by Vercel to assist with remediation efforts.

The security issue is tracked across multiple advisories, including GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React Advisory CVE-2025-55182, and Next.js Advisory CVE-2025-66478. The interconnected nature of these advisories reflects the broad attack surface exposed by the flaw, which sits at the intersection of React's core server component architecture and deployment platforms that rely on the framework. Vercel's automated response indicates the severity of the exposure, though the platform has warned that the generated patch may not be comprehensive and requires manual review before merging.

Organizations running Next.js deployments should treat this vulnerability as a high-priority remediation item. The insecure deserialization vector is particularly dangerous because it can be exploited without authentication, meaning any publicly exposed endpoint processing React Flight data could serve as an entry point. Security teams are advised to review the linked advisories, assess their dependency versions, and apply patches with careful testing to avoid breaking application functionality.
---
- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: cve, rce, react, next.js, vercel
- **Credibility**: unverified
- **Published**: 2026-04-24 17:54:09
- **ID**: 76928
- **URL**: https://whisperx.ai/en/intel/76928