## Critical RCE Vulnerability in React Server Components Flags Unauthenticated Server Access Risk via Insecure Deserialization
A critical remote code execution vulnerability has been identified in React Server Components, exposing applications built on Next.js and related frameworks to unauthenticated server-side attacks. The flaw exploits insecure deserialization within the React Flight protocol, potentially granting attackers full control over affected servers without any credentials or user interaction.

The vulnerability specifically targets the React Flight communication mechanism used for streaming server components to clients. By manipulating deserialization processes, an attacker can execute arbitrary code remotely on the server hosting the application. 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 issue affects projects utilizing React Server Components, including deployments on platforms such as Vercel.

Vercel has generated automated pull requests to assist developers with patching affected projects, though officials caution that these patches may not be comprehensive and could contain errors. Developers are urged to review Vercel's guidance before merging any automated changes. Organizations running React Server Components in production environments should assess their exposure immediately, apply available patches, and verify that the React Flight protocol implementation follows secure deserialization practices. The availability of public advisories suggests this vulnerability has been documented in public security databases, raising the urgency for timely remediation.
---
- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: cve, rce, react, nextjs, vercel
- **Credibility**: unverified
- **Published**: 2026-05-01 16:54:07
- **ID**: 78886
- **URL**: https://whisperx.ai/en/intel/78886