CVE-2026-85169

High

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.

SeverityHigh

CVSS8.8

Exploit probability59. percentile0.9%

Product

N8n

PublishedSep 3, 2026

First seenSep 3, 2026

Weakness typeCWE-94Code injection

How to fix

Update

n8n n8n1.123.73, 2.35.4, 2.36.2 or later

Vendor advisories

github.com/n8n-io/n8n/security/advisories/GHSA-9x83-43r8-5hwc

Affected products

Product	Affected versions	Fixed in
n8n n8n	v < 1.123.73, 2.0.0 ≤ v < 2.35.4, 2.36.0 ≤ v < 2.36.2	1.123.73, 2.35.4, 2.36.2

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