CVE-2026-86078 — n8n: Prototype Pollution via Workflow Structure Summary Can Lead to Denial of Service
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 ord…
Published: 2026-09-08 · CVSS: 6.0 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7