CVE-2026-86078

published 2026-09-08

CVE-2026-86078: 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…

Priority P3 38 medium 6.5 CVSS 3.1

AV N AC L PR L UI N S U C N I N A H

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.

Affected

6 ranges

Vendor	Product	Version range	Fixed in
n8n-io	n8n	< 2.37.7	2.37.7
n8n-io	n8n	—	—
n8n	n8n	< 2.37.7	2.37.7
n8n	n8n	>= 0 < 2.37.7	2.37.7
n8n	n8n	>= 2.38.0 < 2.38.2	2.38.2
n8n	n8n	>= 2.38.0 < 2.38.2	2.38.2

CVSS provenance

nvd v3.1 6.5 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd v4.0 6.0 MEDIUM CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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CWE-1321