CVE-2026-25049 Expression Escape Vulnerability Leading to RCE in n8n

A critical vulnerability identified as CVE-2026-25049 in the n8n workflow automation platform allows authenticated users to execute remote code by exploiting a flaw in the system's expression sanitization process, which fails to enforce runtime type checking for strings. This oversight permits attackers to bypass the sanitization of user-provided JavaScript expressions, enabling them to execute arbitrary code, read or modify files, and access sensitive credentials on the server. The vulnerability, which stems from a mismatch between TypeScript's compile-time type annotations and JavaScript's runtime behavior, has been addressed in n8n version 2.5.2 through the implementation of runtime type validation in the sanitization function. As a result, immediate upgrades to this version are strongly recommended to mitigate risks, especially considering ten other vulnerabilities disclosed on the same day. The fix highlights the importance of not relying solely on static type systems for security and underscores the necessity of multiple validation layers when processing untrusted inputs.

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