## Critical RCE Vulnerability in React Server Components Puts Vercel Next.js Deployments at Risk
A critical remote code execution (RCE) vulnerability has been identified in React Server Components, the technology underpinning Next.js and other modern React frameworks deployed on Vercel's infrastructure. The flaw enables unauthenticated attackers to execute arbitrary code on affected servers through insecure deserialization within the React Flight protocol. Security researchers tracking the exposure warn that the vulnerability affects projects hosted on Vercel, including publicly registered deployments such as the dashboard-solar-fault-detection project.

The security hole is tracked under multiple advisories: GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React advisory CVE-2025-55182, and Next.js advisory CVE-2025-66478. The mechanism of exploitation centers on the React Flight protocol's handling of serialized data streams between server and client components. When the deserialization process fails to properly validate incoming payloads, an attacker can inject malicious serialized objects that, once deserialized, execute system-level commands with the same privileges as the server process. This represents a classic but severe attack surface that has historically enabled complete server compromise.

Vercel has responded by generating automated pull requests targeting vulnerable repositories, though the company cautions that these patches may not be comprehensive and could contain errors. Developers are advised to carefully review Vercel's additional guidance before merging any automated security fixes. The exposure raises concerns about supply chain risks in server-side React ecosystems, where a single vulnerability in core infrastructure can cascade across thousands of dependent projects. Organizations running Next.js applications on Vercel should prioritize patching and audit their deployments for indicators of exploitation attempts.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: cve, rce, nextjs, vercel, react
- **Credibility**: unverified
- **Published**: 2026-04-27 08:54:08
- **ID**: 77362
- **URL**: https://whisperx.ai/en/intel/77362