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.
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Affected Vendors & Products
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Fixes
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References
History
Thu, 03 Sep 2026 11:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | n8n before 1.123.73 Remote Code Execution via $fromAI Prototype Leak | |
| First Time appeared |
N8n
N8n n8n |
|
| Weaknesses | CWE-94 | |
| CPEs | cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:* | |
| Vendors & Products |
N8n
N8n n8n |
|
| References |
| |
| Metrics |
cvssV4_0
|
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MITRE
Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-09-03T11:22:18.688Z
Reserved: 2026-09-03T11:05:09.078Z
Link: CVE-2026-85169
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Weaknesses