n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution
- Product
- n8n
- CVE
- CVE-2026-65591
- Affected
- npm/n8n < 1.123.64; npm/n8n >= 2.0.0-rc.0, < 2.29.8; npm/n8n >= 2.30.0, < 2.30.1
- Fixed in
- 1.123.64, 2.29.8, 2.30.1
Last verified against sources: October 26, 2026
Am I affected?
n8n: affected npm/n8n < 1.123.64; npm/n8n >= 2.0.0-rc.0, < 2.29.8; npm/n8n >= 2.30.0, < 2.30.1. Fixed in 1.123.64, 2.29.8, 2.30.1.
- Check your version: run
npm ls n8n. Versions < 1.123.64 of n8n are affected. [1]
What to do now
- Upgrade to the fixed version: run
npm install n8n@1.123.64(first patched version 1.123.64). [1] - Upgrade to n8n 1.123.64, 2.29.8, or 2.30.1 or later. [1]
- Restrict n8n instance access to fully trusted users only. [1]
- Switch to the non-legacy expression engine by setting
N8N_EXPRESSION_ENGINE=vm. [1]
General practice, not from the source: if the affected software could read tokens or credentials, rotate them after upgrading; pin versions and review changes before updating tools your agents run.
What happened
Impact
- Successful exploitation grants the attacker host-level code execution as the n8n process. [1]
What was done
Sources
- GHSA-pm35-fqvh-cq5g — GitHub Advisory Database
Every statement above was checked against these sources before publishing. Spotted an error? Tell us and we will correct it with a dated note.
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[CVE-2026-65591] n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution
Product: n8n | Affected: npm/n8n < 1.123.64; npm/n8n >= 2.0.0-rc.0, < 2.29.8; npm/n8n >= 2.30.0, < 2.30.1 | Fixed in: 1.123.64, 2.29.8, 2.30.1
Summary: The legacy expression evaluator's computed-member sanitizer can be bypassed by an authenticated user with workflow create or modify permissions.
Source & remediation on AgentArmorHQ: https://agentarmorhq.com/incidents/2026/07/cve-2026-65591-n8nCorrections
Report an error or request a correction. We review requests within 5 business days and add a dated correction note.
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