CVE-2026-85169

n8n before 1.123.73 Remote Code Execution via $fromAI Prototype Leak

State: Published
Severity: 8.7 High
Published: Sep 3, 2026
Updated: Oct 29, 2026
Reserved: Sep 3, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck

Weaknesses

CWE-94 Improper Control of Generation of Code ('Code Injection')

Affected Products

Product	Versions
n8nn8n-io	before 1.123.73Affected 1.123.73Not affected
n8nn8n-io	2.36.0 to before 2.36.2Affected 2.36.2Not affected
n8nn8n-io	2.0.0-rc.0 to before 2.35.4Affected 2.35.4Not affected

References

GitHub Security Advisory (GHSA-9x83-43r8-5hwc)vendor-advisory
VulnCheck Advisory: n8n before 1.123.73 Remote Code Execution via $fromAI Prototype Leakthird-party-advisory

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