n8n: Prototype Pollution via VM Expression Engine Sandbox Escape Leads to Denial of Service
An authenticated user in n8n can exploit the VM expression engine to perform prototype pollution via array-element access, causing a denial of service in the main process. This affects both self-hosted and cloud instances using the vulnerable VM expression engine. The vulnerability is fixed in versions 1.123.67, 2.31.5, and 2.32.1. Temporary mitigations include restricting access to trusted users and disabling the VM expression engine if possible.
AI Analysis
Technical Summary
The vulnerability in n8n allows an authenticated user with permission to create or edit workflow expressions to abuse the VM expression engine's array-element access. This enables the user to obtain a reference to a host built-in object and pollute its prototype within the main n8n process. The prototype pollution leads to a denial of service condition. Both self-hosted and cloud instances running the VM expression engine are affected. The issue has been addressed in n8n versions 1.123.67, 2.31.5, and 2.32.1.
Potential Impact
An attacker with authenticated access to create or edit workflow expressions can cause a denial of service in the main n8n process by polluting the prototype of built-in objects via the VM expression engine. This disrupts normal operation of the n8n service, potentially causing downtime or service unavailability.
Mitigation Recommendations
A fix is available in n8n versions 1.123.67, 2.31.5, and 2.32.1. Users should upgrade to one of these versions or later to remediate the vulnerability. If immediate upgrade is not possible, administrators should restrict access to fully trusted users and consider disabling the VM expression engine if an alternative exists. These workarounds do not fully eliminate the risk and should only be used temporarily.
n8n: Prototype Pollution via VM Expression Engine Sandbox Escape Leads to Denial of Service
Description
An authenticated user in n8n can exploit the VM expression engine to perform prototype pollution via array-element access, causing a denial of service in the main process. This affects both self-hosted and cloud instances using the vulnerable VM expression engine. The vulnerability is fixed in versions 1.123.67, 2.31.5, and 2.32.1. Temporary mitigations include restricting access to trusted users and disabling the VM expression engine if possible.
CVSS v4.0
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in n8n allows an authenticated user with permission to create or edit workflow expressions to abuse the VM expression engine's array-element access. This enables the user to obtain a reference to a host built-in object and pollute its prototype within the main n8n process. The prototype pollution leads to a denial of service condition. Both self-hosted and cloud instances running the VM expression engine are affected. The issue has been addressed in n8n versions 1.123.67, 2.31.5, and 2.32.1.
Potential Impact
An attacker with authenticated access to create or edit workflow expressions can cause a denial of service in the main n8n process by polluting the prototype of built-in objects via the VM expression engine. This disrupts normal operation of the n8n service, potentially causing downtime or service unavailability.
Mitigation Recommendations
A fix is available in n8n versions 1.123.67, 2.31.5, and 2.32.1. Users should upgrade to one of these versions or later to remediate the vulnerability. If immediate upgrade is not possible, administrators should restrict access to fully trusted users and consider disabling the VM expression engine if an alternative exists. These workarounds do not fully eliminate the risk and should only be used temporarily.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-hx4h-vr3m-45vh
- Osv Schema Version
- 1.4.0
- Aliases
- []
- Ecosystems
- ["npm"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 4.0
Threat ID: 6a6150cc9c2644c7f8da0122
Added to database: 07/22/2026, 23:22:52 UTC
Last enriched: 07/22/2026, 23:26:44 UTC
Last updated: 07/22/2026, 23:26:44 UTC
Views: 2
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