## Critical RCE Vulnerability in React Server Components Exposes Next.js Deployments to Remote Code Execution
A critical remote code execution vulnerability in React Server Components has been identified, posing a significant security risk to applications built on 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. Security advisories tracking the vulnerability include GitHub Security Advisory GHSA-9qr9-h5gf-34mp, React Advisory CVE-2025-55182, and Next.js Advisory CVE-2025-66478.

The vulnerability was discovered in the project portfolio-site, hosted on Vercel under the account eunseos-projects-92a1339d. In response, Vercel automatically generated a pull request to assist with patching efforts. The company emphasized that the automated fix may not be comprehensive and could contain errors, urging maintainers to review their guidance before merging any changes. This automated remediation approach highlights the urgency of addressing the deserialization flaw before active exploitation occurs.

The disclosure adds to a growing list of security concerns surrounding server-side rendering technologies and the React ecosystem. Organizations leveraging React Server Components in production environments should immediately audit their deployments, apply available patches, and monitor for indicators of compromise. The cross-framework impact—affecting not only Next.js but potentially other frameworks relying on the React Flight protocol—underscores the systemic nature of the vulnerability. Security teams are advised to treat this as a critical priority given the potential for full server takeover without authentication.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: React, Next.js, RCE, CVE, security vulnerability
- **Credibility**: unverified
- **Published**: 2026-04-28 11:54:09
- **ID**: 77792
- **URL**: https://whisperx.ai/en/intel/77792