CVE-2026-118678

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    CVE-2026-118678

    Published: 28 Oct 2026Last Modified: 2 Nov 2026

    Summary: n8n before 2.41.4 and 2.42.1 Prototype Pollution DoS via Workflow History Compaction

    Details: n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability that allows low-privileged users to alter built-in object behaviour by saving workflows with specially named connection keys. Attackers can add keys such as __proto__ to workflow connections, which the periodic history compaction task processes, causing logins and writes to fail with server errors.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118678.json, https://github.com/n8n-io/n8n/security/advisories/GHSA-fvv4-gmv9-xqf5, https://nvd.nist.gov/vuln/detail/CVE-2026-118678, https://www.vulncheck.com/advisories/n8n-before-2.41.4-and-2.42.1-prototype-pollution-dos-via-workflow-history-compaction

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -063ba759a74de9d32debd423225c4fca5615891f

    Affected versions

    [email protected]

    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-2026-118678 | CVE-DB