n8n versions before 1.123.69, 2.33.4, and 2.34.1 contain a JavaScript task runner VM sandbox escape. The runner's prototype-freezing routine covers globalThis functions but not internal module constructors such as EventEmitter, allowing an authenticated user with Code node access to exploit prototype pollution to execute arbitrary commands within the runner container. Because the polluted prototype is a process-wide object, the corruption persists across other tenants' Code node executions on the same shared runner. On v1.x instances without task runners enabled, Code node JavaScript runs directly in the main n8n process, where the impact could be higher.
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Affected Vendors & Products
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History
Thu, 20 Aug 2026 16:30:00 +0000
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ssvc
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Thu, 20 Aug 2026 11:45:00 +0000
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| Description | n8n versions before 1.123.69, 2.33.4, and 2.34.1 contain a JavaScript task runner VM sandbox escape. The runner's prototype-freezing routine covers globalThis functions but not internal module constructors such as EventEmitter, allowing an authenticated user with Code node access to exploit prototype pollution to execute arbitrary commands within the runner container. Because the polluted prototype is a process-wide object, the corruption persists across other tenants' Code node executions on the same shared runner. On v1.x instances without task runners enabled, Code node JavaScript runs directly in the main n8n process, where the impact could be higher. | |
| Title | n8n before 1.123.69 Remote Code Execution via EventEmitter Prototype Pollution | |
| First Time appeared |
N8n
N8n n8n |
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| Weaknesses | CWE-94 | |
| CPEs | cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:* | |
| Vendors & Products |
N8n
N8n n8n |
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| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-08-21T11:21:19.488Z
Reserved: 2026-08-20T10:51:39.784Z
Link: CVE-2026-77077
Updated: 2026-08-20T15:44:27.484Z
Status : Received
Published: 2026-08-20T12:16:39.127
Modified: 2026-08-21T12:16:35.353
Link: CVE-2026-77077
No data.
OpenCVE Enrichment
Updated: 2026-08-21T13:02:04Z