Critical RCE Vulnerability in React Server Components Exposes Next.js Deployments to Server-Side Code Execution
A critical remote code execution vulnerability has been identified in React Server Components, the server-side rendering architecture used by modern React frameworks including Next.js. The flaw resides in insecure deserialization handling within the React Flight protocol, the mechanism that serializes and transfers component data between server and client. Tracked as CVE-2025-55182, the vulnerability permits unauthenticated attackers to execute arbitrary code on affected servers, representing one of the most severe classes of security defects possible in web infrastructure.
The exposure extends across the broader React ecosystem, with coordinated advisories issued by multiple organizations. GitHub Security Lab published GHSA-9qr9-h5gf-34mp covering the general vulnerability, while React maintainers issued CVE-2025-55182 and the Next.js team separately published CVE-2025-66478 addressing framework-specific attack vectors. The project "sira-doc," hosted on Vercel under the account harounakanes-projects, has been identified as a confirmed affected deployment. The automated pull request generated by Vercel attempts to upgrade dependencies as a remediation measure, though the notice explicitly warns that comprehensive coverage cannot be guaranteed and advises manual review before merging.
Organizations running Next.js or other React-based frameworks with Server Components enabled face immediate patching obligations. Security teams should audit their dependency trees against the published CVE identifiers, prioritize deployment of official patches, and carefully evaluate any automated PRs generated by hosting platforms. The combination of unauthenticated exploitability, remote code execution capability, and broad framework adoption creates significant risk exposure across production environments. Given the severity classification, treating this as an active threat until patches are confirmed deployed represents the prudent operational posture.