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.

References

Advisories
More

https://www.vulncheck.com/advisories/n8n-before-1.123.73-remote-code-execution-via-fromai-prototype-leak

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

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-70404

Details

Source: Mitre, NVD

Published: 2026-09-03

Updated: 2026-09-18

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.8

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

CVSS v4

Base Score: 8.7

Vector: 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

Severity: High

EPSS

EPSS: 0.00879