| Component | n8n |
| Severity | medium (CVSS 6.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Published (NVD) | 2026-09-08 |
| Last modified | 2026-09-11 |
| Affected versions | n8n < 2.37.7 n8n >= 2.38.0, < 2.38.2 |
| Fixed in | 2.37.7, 2.38.2 |
| Weakness | CWE-1321 |
| CISA KEV | not listed |
NVD description
n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.2, the Instance AI workflow summary used node names and connection keys from stored workflows as ordinary object keys. A workflow submitted through the REST API could contain __proto__ or constructor, causing nested writes to reach Object.prototype in the main n8n process and disrupt later requests. The affected function is summarizeWorkflowStructure in packages/@n8n/instance-ai/src/tools/workflows/summarize-workflow.ts. This issue is fixed in versions 2.37.7 and 2.38.2.
What to do
- Upgrade n8n to
2.37.7or later (or the patched release of your branch: 2.38.2). - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-86078
- https://github.com/n8n-io/n8n/security/advisories/GHSA-679f-58pq-4v2c
- https://github.com/n8n-io/n8n/releases/tag/[email protected]
- https://github.com/n8n-io/n8n/releases/tag/[email protected]
Read more
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