CVE-2025-55182: Critical React RCE — How to Patch Your App NOW

CVE-2025-55182: Critical React RCE — How to Patch Your App NOW TL;DR: If you're running React 19.0.0–19.2.0 with Server Components (including Next.js), your app is vulnerable to remote code execution via a single HTTP request. Upgrade to 19.2.1 (or higher), 19.1.2 (or higher), or 19.0.1 (or higher) immediately. The Problem On March 2025, a critical vulnerability was disclosed in React's Server Components implementation. The vulnerability—designated CVE-2025-55182 —carries a CVSS score of 10.0 , the maximum possible severity. This isn't a theoretical vulnerability. A single crafted HTTP request can give an attacker complete control over your server. No authentication required. No special privileges needed. The root cause: improper handling of serialized payloads in React Server Functions allows attackers to inject and execute arbitrary code. Vulnerability Details What Makes This CVSS 10.0? The Common Vulnerability Scoring System rates vulnerabilities from 0 to 10. A 10.0 score means: At