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CVE-2026-118678

CVE-2026-118678 · n8n before 2.41.4 and 2.42.1 Prototype Pollution DoS via Workflow History Compaction

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

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.

CVSS 7.1 · High · EPSS 0.3% · Fix available

Published
Updated

Affected products and versions

  • n8n

    Versions
    • ≥ 0, < 2.41.4: Affected (semver)
    • 2.41.4: Not affected (semver)

    Update to 2.41.4

  • n8n

    Versions
    • ≥ 2.42.0, < 2.42.1: Affected (semver)
    • 2.42.1: Not affected (semver)

    Update to 2.42.1

Original sources

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