## Unpatched React Flight Protocol Flaw Poses Unauthenticated RCE Risk for Next.js Deployments
A critical remote code execution vulnerability in React Server Components has triggered an emergency response across the developer ecosystem. The flaw, rooted in insecure deserialization within the React Flight protocol, enables unauthenticated attackers to execute arbitrary code on affected servers. The issue, tracked under GitHub Security Advisory GHSA-9qr9-h5gf-34mp and assigned CVE-2025-55182, poses a significant threat to applications built on frameworks including Next.js.

The vulnerability was identified in the project content-factory hosted on Vercel's platform. React maintainers and the Next.js security team have published dedicated advisories—CVE-2025-55182 and CVE-2025-66478 respectively—outlining the technical details of the deserialization weakness. Vercel has automatically generated pull requests targeting the flaw in affected repositories, though officials caution that these patches may require manual review before deployment. The automated approach aims to accelerate remediation across the large number of potentially exposed projects.

The core risk stems from the React Flight protocol's handling of serialized data during server component rendering. An unauthenticated attacker exploiting this flaw could potentially gain full control of the underlying server environment. Security researchers warn that the vulnerability could affect a broad range of production deployments, particularly those with public-facing server component endpoints. Developers using Next.js and related React Server Component frameworks are advised to review Vercel's patching guidance, evaluate the automated PRs for compatibility with their environments, and apply updates with appropriate testing before merging.

The coordinated disclosure highlights ongoing challenges in securing the increasingly complex JavaScript tooling ecosystem, where protocol-level vulnerabilities in foundational libraries can cascade across thousands of dependent applications.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: remote-code-execution, react-server-components, nextjs, deserialization, cve
- **Credibility**: unverified
- **Published**: 2026-05-07 09:31:47
- **ID**: 80116
- **URL**: https://whisperx.ai/en/intel/80116