## Critical RCE Vulnerability in React Server Components Exposes Next.js and Other Frameworks
A critical remote code execution (RCE) vulnerability has been identified within React Server Components, enabling unauthenticated attackers to execute arbitrary code on the server. The flaw stems from insecure deserialization in the React Flight protocol, a core mechanism for data transfer. This vulnerability directly impacts major frameworks like Next.js, potentially exposing a vast number of web applications to server takeover.

The issue was discovered in the project 'hacktober2025' and is being tracked under multiple advisories, including GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React's CVE-2025-55182, and Next.js's CVE-2025-66478. Vercel has generated an automated pull request to assist with patching, though it explicitly warns that the fix may not be comprehensive and could contain mistakes, urging developers to review additional guidance before merging.

The discovery places immediate pressure on development teams using React Server Components, particularly within the Next.js ecosystem, to audit and update their dependencies. The nature of the flaw—exploiting the serialization protocol—means that any application leveraging this feature for server-side rendering is potentially at risk until patched. This incident underscores the persistent security challenges in modern web frameworks and the critical need for proactive vulnerability management in widely adopted open-source infrastructure.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: cybersecurity, vulnerability, web development, react, nextjs
- **Credibility**: unverified
- **Published**: 2026-04-04 13:27:04
- **ID**: 50021
- **URL**: https://whisperx.ai/en/intel/50021