CVE-2026-118678 n8n - Prototype Pollution

n8n < 2.41.4 and 2.42.x < 2.42.1 contains a prototype pollution vulnerability caused by saving workflows with specially named connection keys, letting low-privileged users cause server errors by altering built-in object behavior, exploit requires low-privileged user access.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Prototype Pollution
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Published
28 October 2026
Updated
29 October 2026
Weakness
CWE-1321

Vendor fix

Upgrade to versions 2.41.4 or 2.42.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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