Next.js React Server Components - Secure Design
How the Next.js RSC template architecture protects against React Server Components vulnerabilities through process isolation and defense-in-depth security
In this episode, we dive into React Server Components security after three critical vulnerabilities hit Next.js in December 2025 - including one with a perfect CVSS 10.0 score. We'll walk through how the Next.js RSC template achieves security by design through a defense-in-depth architecture that makes entire classes of attacks physically impossible.
The key insight? By using Next.js RSC as a pure rendering layer that delegates all data operations to type-safe ServiceStack .NET APIs, we eliminate the vulnerable Server Functions entirely. But we don't stop there. Even if Server Functions were accidentally introduced or new vulnerabilities discovered, process-level isolation ensures the Node.js layer runs as an unprivileged user with zero access to databases, configuration files, API keys, or any .NET resources.
We'll explore the specific isolation techniques - file system permissions, environment variable separation, and process boundaries - and show how automated testing continuously verifies these security guarantees. Whether you're building new applications or securing existing ones, you'll learn practical patterns for defense-in-depth architecture that protects against both known and future vulnerabilities.