## Critical RCE Vulnerability in React Server Components Exposes Next.js Deployments to Remote Code Execution
A critical remote code execution vulnerability has been identified in React Server Components, affecting applications built with frameworks including Next.js. The flaw enables unauthenticated attackers to execute arbitrary code on servers by exploiting insecure deserialization within the React Flight protocol. The vulnerability was discovered in the Vercel-hosted project "our-adventure," prompting immediate issuance of official security advisories across multiple platforms.

The flaw is tracked under three separate advisories: GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React advisory CVE-2025-55182, and Next.js advisory CVE-2025-66478. Vercel has automatically generated a pull request to patch the issue in affected projects, though the company cautions that the automated fix may not be comprehensive and urges developers to review additional guidance before merging. The React Flight protocol, which handles server-to-client component streaming, contains the deserialization weakness that allows the RCE vector.

Developers using React Server Components in production environments face immediate pressure to assess their exposure. The vulnerability affects the server-side rendering pipeline, meaning any application that passes untrusted data through the React Flight protocol could be susceptible. Security researchers warn that the combination of unauthenticated access and remote code execution capability represents a severe risk profile. Organizations should prioritize patch deployment and audit their React Server Component implementations for any custom serialization logic that could compound the issue.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: react, next.js, rce, cve, vercel
- **Credibility**: unverified
- **Published**: 2026-04-24 12:54:12
- **ID**: 76830
- **URL**: https://whisperx.ai/en/intel/76830