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Runtime Security Boundaries Require Runtime Enforcement: Lessons from n8n’s CVE Chain

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Isometric diagram showing a dark server chassis with an expression evaluator unit. An empty mounting frame at the evaluator's input boundary has no barrier plate installed. An amber signal beam passes through the empty frame and strikes the execution module, which glows amber. Teal circuit traces terminate at the frame edge without connecting to the execution path.

n8n’s five critical CVEs in 90 days share a single architectural flaw: TypeScript type annotations used as runtime security enforcement — but TypeScript annotations don’t exist at JavaScript runtime. The patch for the first CVE was bypassed by the same mechanism two months later. If you build AI agent pipelines or any sandbox with compile-time security constraints, this CVE chain names the failure directly.