CVE-2026-110848

Medium

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.

SeverityMedium

CVSS6.0

Exploit probability—

ProductN8n

PublishedOct 14, 2026

First seenOct 14, 2026

Weakness typeCWE-1321Prototype pollution

How to fix

Update

n8n-io n8n1.123.83, 2.41.4, 2.42.1 or later

Vendor advisories

github.com/n8n-io/n8n/security/advisories/GHSA-3p2g-2wpm-8h3g

Affected products

Product	Affected versions	Fixed in
n8n-io n8n	v < 1.123.83, 2.0.0 ≤ v < 2.41.4, 2.42.0 ≤ v < 2.42.1	1.123.83, 2.41.4, 2.42.1

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