## Vercel Issues Emergency Patch for Critical React Server Components RCE Vulnerability Affecting Next.js Deployments
Vercel has released an automated security patch addressing a critical remote code execution vulnerability in React Server Components that exposes Next.js applications to unauthenticated server-side attacks. The flaw resides in insecure deserialization within the React Flight protocol, enabling threat actors to execute arbitrary code on affected servers without authentication credentials. The vulnerability has been assigned multiple tracking identifiers across major security advisories, including GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React Advisory CVE-2025-55182, and Next.js Advisory CVE-2025-66478.

The affected project, identified as "ttx" on the Vercel platform, served as the initial discovery point for the vulnerability. Vercel has generated an automatic pull request to upgrade the compromised React and Next.js dependencies, though the company cautions that the patch may not be fully comprehensive and requires manual review before merging. Organizations using React Server Components in production environments face immediate exposure, particularly those running frameworks that implement the React Flight protocol for server-to-client data streaming. The vulnerability affects a broad range of deployments beyond the initial discovery project.

Security teams are advised to immediately review Vercel's guidance documentation and apply the provided patch after thorough evaluation. The React core team and Next.js maintainers have both published dedicated security advisories detailing the vulnerability. While Vercel cannot guarantee the automated fix addresses every potential attack vector, the patch represents the first line of defense against exploitation. Organizations unable to deploy the patch immediately should consider disabling React Server Components features or implementing additional network-level restrictions as temporary mitigation measures.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: react-server-components, remote-code-execution, nextjs, vercel, cve-2025-55182
- **Credibility**: unverified
- **Published**: 2026-05-05 23:31:39
- **ID**: 79574
- **URL**: https://whisperx.ai/en/intel/79574