CVE-2026-118678

HighCVSS 7.1/10Last modified Oct 29, 2026

Description

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.

Metrics

CVSS 3.1 7.1/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Weakness enumeration

CWE-1321

Affected software

Vendor	Product	Versions
n8n-io	n8n	< 2.41.4
n8n-io	n8n	>= 2.42.0, < 2.42.1

References

Timeline

Published: Oct 28, 2026
Last modified: Oct 29, 2026
NVD status: Deferred

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