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CVE-2026-110848 Details

ANALYZED

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

Description

n8n before 1.123.83, 2.x before 2.41.4, and 2.42.x before 2.42.1 contains a prototype pollution vulnerability in the AI workflow builder, which merges workflow connections using node names as object members without checking for reserved keys. Authenticated users can create nodes named __proto__ through the API and invoke the connect-nodes operation to pollute the global object prototype, disrupting the instance until restart.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-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-3p2g-2wpm-8h3g	[email protected]	AdvisoryRemedyVendor
https://www.vulncheck.com/advisories/n8n-before-1.123.83-2.41.4-and-2.42.1-prototype-pollution-via-ai-workflow-builder-connection-merge	[email protected]	Advisory

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	< 1.123.83 (semver) < 2.41.4 (semver) < 2.42.1 (semver)
CPE cpe:2.3:a:n8n:n8n::::::node.js::* Remediation Upgrade: >= 1.123.83moderate effort 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 the AI Builder feature if it is not required. Mitigation:low effort Audit existing workflows for nodes with reserved JavaScript property names such as __proto__, constructor, or prototype and remove or rename them.

Product

Versions

n8n

< 1.123.83 (semver)

< 2.41.4 (semver)

< 2.42.1 (semver)

CPE

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

Remediation

Upgrade: >= 1.123.83moderate effort
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 the AI Builder feature if it is not required.
Mitigation:low effort
Audit existing workflows for nodes with reserved JavaScript property names such as __proto__, constructor, or prototype and remove or rename them.

Change History

2 change records found show changes

Date	Action	Recorded By
Oct 16, 2026	CVE Modified	CISA-ADP
Oct 14, 2026	New CVE Received	[email protected]