| Component | n8n |
| Severity | high (CVSS 7.6) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L |
| Published (NVD) | 2026-08-20 |
| Last modified | 2026-09-01 |
| Affected versions | n8n < 1.123.69 n8n >= 2.33.0, < 2.33.4 n8n = 2.34.0 |
| Fixed in | 1.123.69, 2.33.4 |
| Weakness | CWE-94 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade n8n to
1.123.69or later (or the patched release of your branch: 2.33.4). - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-77077
- https://github.com/n8n-io/n8n/security/advisories/GHSA-m3hg-p5r9-fg9h
- https://www.vulncheck.com/advisories/n8n-before-remote-code-execution-via-eventemitter-prototype-pollution
Read more
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