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CVE-2026-118678 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.x Severity and Vector Strings:

VolerionCVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H

CNA: [email protected]CVSS-B:7.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/n8n-io/n8n/security/advisories/GHSA-fvv4-gmv9-xqf5	[email protected]	AdvisoryRemedyVendor
https://www.vulncheck.com/advisories/n8n-before-2.41.4-and-2.42.1-prototype-pollution-dos-via-workflow-history-compaction	[email protected]	AdvisoryVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1321	Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')	[email protected]

Affected Products

Product	Versions
n8n	< 2.41.4 (semver) >= 2.42.0, < 2.42.1 (semver)
CPE cpe:2.3:a:n8n:n8n::::::node.js::* Remediation Upgrade: 2.41.4moderate effort Upgrade: 2.42.1moderate effort Mitigation:low effort Restrict n8n instance access to fully trusted users only. Mitigation:low effort Disable workflow history by setting N8N_WORKFLOW_HISTORY_ENABLED=false if the feature is not required. Mitigation:low effort Audit existing workflows for nodes with reserved JavaScript property names such as __proto__, constructor, or prototype in their connections and remove or rename them.

Product

Versions

n8n

< 2.41.4 (semver)

>= 2.42.0, < 2.42.1 (semver)

CPE

cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*

Remediation

Upgrade: 2.41.4moderate effort
Upgrade: 2.42.1moderate effort
Mitigation:low effort
Restrict n8n instance access to fully trusted users only.
Mitigation:low effort
Disable workflow history by setting N8N_WORKFLOW_HISTORY_ENABLED=false if the feature is not required.
Mitigation:low effort
Audit existing workflows for nodes with reserved JavaScript property names such as __proto__, constructor, or prototype in their connections and remove or rename them.

Change History

2 change records found show changes

Date	Action	Recorded By
Oct 29, 2026	CVE Modified	CISA-ADP
Oct 28, 2026	New CVE Received	[email protected]