## Critical RCE Vulnerability in React Server Components Exposes Next.js Deployments via Insecure Deserialization
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, which enables unauthenticated RCE on affected servers, stems from insecure deserialization within the React Flight protocol. Security researchers discovered the vulnerability in the project insight-forge-dashboard, prompting coordinated advisories from multiple organizations including Vercel, the React team, and Next.js maintainers.

The vulnerability is being tracked under three separate security advisories: GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React advisory CVE-2025-55182, and Next.js advisory CVE-2025-66478. Vercel has automatically generated pull requests for affected projects to assist with patching efforts, though the company cautions that these automated changes may not be comprehensive and could contain errors. Users are advised to carefully review Vercel's additional guidance before merging any patches.

The discovery raises serious concerns for the broader React Server Components ecosystem, given the widespread adoption of Next.js across production environments. The React Flight protocol, which facilitates server-to-client data streaming, contains the deserialization flaw that could allow attackers to execute arbitrary code without authentication credentials. Organizations running vulnerable deployments should prioritize reviewing the linked security advisories and apply patches immediately, while remaining vigilant for potential exploitation attempts in the wild.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: react-server-components, next.js, rce, cve, vercel
- **Credibility**: unverified
- **Published**: 2026-05-03 07:54:09
- **ID**: 79092
- **URL**: https://whisperx.ai/en/intel/79092