CVE-2026-54311: n8n: Merge Node SQL Mode Prototype Pollution

An authenticated user with permission to create or modify workflows could pollute the sandbox used by the Merge node’s SQL Query mode. Because the sandbox context was cached and reused across all workflow executions on the instance, prototype mutations introduced by one user’s workflow persist into subsequent Merge SQL executions belonging to other users or projects. This allowed a low-privileged attacker to intercept workflow data processed by other users on the same instance.

This issue only affects multi-user n8n instances where more than one user has permission to create and execute workflows containing the Merge node in SQL Query mode.