## Critical RCE Vulnerability in React Server Components Exposes Next.js Applications via Insecure Deserialization
A critical remote code execution vulnerability has been identified in React Server Components, with severity implications for applications built on Next.js and other frameworks utilizing the React Flight protocol. The flaw, tracked across multiple security advisories, enables unauthenticated remote code execution on affected servers through insecure deserialization mechanisms embedded within the protocol's data handling. The vulnerability was discovered impacting the Vercel-hosted project "jungwon-oyyy," prompting the platform to generate automated pull requests for patching across affected repositories.

The security exposure centers on how React Server Components process serialized data during server-client communication. Attackers can exploit this by crafting malicious payloads that, when deserialized by the server, execute arbitrary code without requiring authentication. This places any application failing to apply available patches at immediate risk of compromise. The vulnerability affects the React ecosystem broadly, though specific advisories have been issued for both the core React library and the Next.js framework, indicating the attack surface spans multiple layers of the technology stack.

Security advisories GHSA-9qr9-h5gf-34mp, CVE-2025-55182, and CVE-2025-66478 have been published to track the vulnerability across the affected projects. Vercel has automatically generated pull requests for projects under its management, though administrators are cautioned to review the proposed changes before merging. The React team has published dedicated guidance at react.dev, while Next.js maintains its own security bulletin at nextjs.org. Organizations running React Server Components are urged to prioritize patching immediately, as proof-of-concept exploitation methods are likely to emerge rapidly given the severity and public disclosure of the vulnerability.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: React Server Components, RCE vulnerability, Next.js, CVE-2025-55182, insecure deserialization
- **Credibility**: unverified
- **Published**: 2026-05-06 06:31:43
- **ID**: 79663
- **URL**: https://whisperx.ai/en/intel/79663