CVE-2026-85169

Summary

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 Software

Weaknesses

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

References

• https://github.com/n8n-io/n8n/security/advisories/GHSA-9x83-43r8-5hwc
• https://www.vulncheck.com/advisories/n8n-before-1.123.73-remote-code-execution-via-fromai-prototype-leak

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