p PatchFirst

CVE-2026-86078

CVE-2026-86078 · n8n: Prototype Pollution via Workflow Structure Summary Can Lead to Denial of Service

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 6.0 · Medium · EPSS 0.6% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • n8n

    Versions
    • < 2.37.7: Affected
    • >= 2.38.0, < 2.38.2: Affected

    No fix published

  • n8n npm

    Affected ranges
    • SEMVER: ≥ 2.38.0, < 2.38.2

    Update to 2.38.2

  • n8n npm

    Affected ranges
    • SEMVER: < 2.37.7

    Update to 2.37.7

Original sources

Check your server →