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CVE-2026-65591 — Vulnerability in n8n — CVE Details

HIGH

n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution

Published July 22, 2026Updated July 22, 2026Source: osv

Summary

## 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.

Advisory Timeline

  • First published July 22, 2026 (82 days ago).
  • Last revised July 22, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update n8n to 1.123.64 or later
npm install n8n@1.123.64
npm
Update n8n to 2.29.8 or later
npm install n8n@2.29.8
npm
Update n8n to 2.30.1 or later
npm install n8n@2.30.1

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: npm (1).

PackageEcosystemAffectedFixed In
n8n
npm
All versions1.123.64
n8n
npm
All versions2.29.8
n8n
npm
All versions2.30.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L

References

Frequently Asked Questions

What is CVE-2026-65591?
n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution This vulnerability has been assigned a severity rating of HIGH (CVSS score: 9.5/10).
How do I check if my project is affected by CVE-2026-65591?
CVE-2026-65591 affects n8n. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-65591 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.5

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-pm35-fqvh-cq5g

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