AI agent vulnerability · n8n

CVE-2026-65591: n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution

highCVSS 4.0 8.9GHSA-pm35-fqvh-cq5g

Impact The legacy expression evaluator's computed-member sanitizer can be bypassed by an authenticated user with workflow create or modify permissions. Successful exploitation grants the attacker host-level code execution as the n8n process. The legacy expression engine is the default engine in affected versions. Patches The issue has been fixed in n8n versions 1.123.64, 2.29.8, and 2.30.1.

Published Jul 22, 2026

Affected packages

n8n

Ecosystem: npm
Affected: < 1.123.64
Fixed in: 1.123.64
Check: npm ls n8n

n8n

Ecosystem: npm
Affected: >= 2.30.0, < 2.30.1
Fixed in: 2.30.1
Check: npm ls n8n

n8n

Ecosystem: npm
Affected: >= 2.0.0-rc.0, < 2.29.8
Fixed in: 2.29.8
Check: npm ls n8n

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Impact

The legacy expression evaluator's computed-member sanitizer can be bypassed by an authenticated user with workflow create or modify permissions. Successful exploitation grants the attacker host-level code execution as the n8n process.

The legacy expression engine is the default engine in affected versions.

Patches

The issue has been fixed in n8n versions 1.123.64, 2.29.8, and 2.30.1. Users should upgrade to one of these versions or later to remediate the vulnerability.

Workarounds

If upgrading is not immediately possible, administrators should consider the following temporary mitigations:

Restrict n8n instance access to fully trusted users only.
Switch to the non-legacy expression engine by setting N8N_EXPRESSION_ENGINE=vm.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Credited to Dremig.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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