CVE-2026-118678
Published:October 28, 2026
Updated:October 30, 2026
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.
Affected Packages
https://github.com/n8n-io/n8n.git (GITHUB):
Affected version(s) >=n8n@2.3.0 <n8n@2.41.4Fix Suggestion:
Update to version n8n@2.41.4https://github.com/n8n-io/n8n.git (GITHUB):
Affected version(s) =n8n@2.42.0 <n8n@2.42.1Fix Suggestion:
Update to version n8n@2.42.1n8n-workflow (NPM):
Affected version(s) >=2.3.0 <2.41.1Fix Suggestion:
Update to version 2.41.1n8n (NPM):
Affected version(s) >=2.3.0 <2.41.4Fix Suggestion:
Update to version 2.41.4n8n-workflow (NPM):
Affected version(s) =2.42.0 <2.42.1Fix Suggestion:
Update to version 2.42.1n8n (NPM):
Affected version(s) =2.42.0 <2.42.1Fix Suggestion:
Update to version 2.42.1Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
HIGH
Weakness Type (CWE)
Improperly Controlled Modification of Object Prototype Attributes
EPSS
Base Score:
0.29