CVE-2026-85169: n8n

High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days.

n8n versions before 1.123.73, 2.35.4, and 2.36.2 contain an expression sandbox escape in the $fromAI handler. $fromAI resolved a caller-supplied placeholder name without requiring it to be an own property and admitted reserved keys; against a primitive input value it returned a live host-prototype reference. An attacker with workflow-build privilege can walk the prototype chain to the Function constructor and compile/execute arbitrary code in the main n8n process, leading to remote code execution.

Affected products

• n8n n8n: before 1.123.73 (fixed in 1.123.73); from 2.0.0, before 2.35.4 (fixed in 2.35.4); from 2.36.0, before 2.36.2 (fixed in 2.36.2)

Published 2026-09-03. Last modified 2026-09-18.