CVE-2026-86078

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    CVE-2026-86078

    Published: 8 Sept 2026Last Modified: 13 Sept 2026

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

    Details: 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.

    References: https://github.com/n8n-io/n8n/releases/tag/[email protected], https://github.com/n8n-io/n8n/releases/tag/[email protected], https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86078.json, https://github.com/n8n-io/n8n/security/advisories/GHSA-679f-58pq-4v2c, https://nvd.nist.gov/vuln/detail/CVE-2026-86078

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -2a4ca7868dc75edca4c575d6507021e1e6b0ec90

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-86078 | CVE-DB