Breaking Down CVE-2026-25049: How TypeScript Types Failed n8n's Security
Summary
The post analyzes CVE-2026-25049 and explains how TypeScript’s compile-time types failed to provide runtime security for an open-source workflow platform (n8n). It shows that inputs act as strings at compile time but can be non-strings at runtime, allowing a bypass of sanitization and evaluation layers. The piece emphasizes that TypeScript is not a security boundary and advocates defense-in-depth, runtime validation, and proper sandboxing for systems evaluating untrusted input.