## React Server Components Critical RCE Vulnerability Disclosed: Insecure Deserialization Flaw Targets Next.js Deployments
A critical remote code execution vulnerability has been identified in React Server Components, with disclosed advisories confirming exposure across frameworks including Next.js. The flaw stems from insecure deserialization within the React Flight protocol, enabling unauthenticated attackers to execute arbitrary code on affected servers. Vercel flagged the vulnerability in the project "lading-page-clinica" and issued an automated patch pull request to address the issue.

The vulnerability is tracked under GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React Advisory CVE-2025-55182, and Next.js Advisory CVE-2025-66478. The mechanism allows unauthenticated RCE by exploiting insecure deserialization in how React Server Components handle data across the client-server boundary. Vercel's automated PR carries a warning that the proposed fixes may be incomplete and could contain errors, urging maintainers to review the changes carefully before merging.

The disclosure raises concerns for organizations running React Server Components in production environments. While the automated patch demonstrates active remediation efforts, the acknowledgment of potential gaps in coverage signals that thorough manual review remains necessary. Security teams should cross-reference the official advisories from GitHub, React, and Next.js to assess their specific exposure and apply any additional hardening measures beyond the automated fix.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: RCE, CVE, Next.js, React, deserialization
- **Credibility**: unverified
- **Published**: 2026-05-11 16:10:34
- **ID**: 81876
- **URL**: https://whisperx.ai/en/intel/81876