EUVD-2026-74278

n8n: Prototype Pollution via Workflow Structure Summary Can Lead to Denial of Service...

n8n: Prototype Pollution via Workflow Structure Summary Can Lead to Denial of Service

Impact The Instance AI workflow summary built its result with get-or-create-then-nested-write idioms keyed by node names and connection keys taken from the stored workflow. Those are arbitrary strings: the restricted-name guard n8n shows in the editor is client-side and is bypassed by posting the...

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 ordinary object keys. A workflow submitted through the REST API could contain proto or constructor, causing nested writes t...

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 ordinary object keys. A workflow submitted through the REST API could contain proto or constructor, causing nested writes t...

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 ordinary object keys. A workflow submitted through the REST API could contain proto or constructor, causing nested writes t...

CVE-2026-86078

n8n (open-source workflow automation platform) is affected by a prototype pollution vulnerability in the Instance AI workflow summary feature prior to versions 2.37.7 and 2.38.2 . The function summarizeWorkflowStructure (in packages/@n8n/instance-ai/src/tools/workflows/summarize-workflow.ts) trea...