# CVE-2026-110848: n8n prototype pollution in AI workflow builder

Source: https://junglewise.ai/threats/cve-2026-110848-n8n-before-1-123-83-2-x-before-2-41-4-and-2-42-x-before-2-42-1  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-110848 · Severity: info · Published 2026-10-14

n8n is a workflow automation platform that allows users to connect applications and automate tasks. An authenticated attacker can create special nodes that pollute the JavaScript prototype, causing the entire n8n instance to malfunction until it is restarted. This disrupts all workflows running on that instance and requires manual intervention to recover.

Technologies: [N8n](https://junglewise.ai/threats/technologies/n8n). Vendors: [N8n](https://junglewise.ai/threats/vendors/n8n).

## Quick answers

**Is CVE-2026-110848 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-110848 being exploited in the wild.

**How severe is CVE-2026-110848?** Informational severity, published 14 October 2026.

**Which products and versions are affected?** N8n before 1.123.83, 2.x before 2.41.4, 2.42.x before 2.42.1.

**Is there a fix for CVE-2026-110848?** Yes: fixed in n8n 1.123.83, 2.41.4, 2.42.1. Until then: Restrict n8n instance access to fully trusted users only, or disable the AI Builder feature if not required. Audit existing workflows for nodes with reserved JavaScript property names such as __proto__, constructor, or prototype and remove or rename them.</anigation>
<parameter name="timeline">[{"kind":"disclosed","at":"2026-09-30"},{"kind":"advisory","at":"2026-10-14"}] Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-110848 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-110848?** Check whether you run N8n at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in n8n 1.123.83, 2.41.4, 2.42.1

Restrict n8n instance access to fully trusted users only, or disable the AI Builder feature if not required. Audit existing workflows for nodes with reserved JavaScript property names such as __proto__, constructor, or prototype and remove or rename them.</anigation>
<parameter name="timeline">[{"kind":"disclosed","at":"2026-09-30"},{"kind":"advisory","at":"2026-10-14"}]

## Technical details

The vulnerability is a prototype pollution flaw in the AI workflow builder's connect-nodes operation, which merges workflow connections using node names directly as object members without validating against reserved JavaScript keys like __proto__. An authenticated attacker can bypass the editor's restrictions by sending a crafted API request to create a node named __proto__ and trigger the connect-nodes operation, polluting the global object prototype and causing a denial of service.

## Affected products

- n8n n8n before 1.123.83, 2.x before 2.41.4, 2.42.x before 2.42.1

## References

- [https://github.com/n8n-io/n8n/security/advisories/GHSA-3p2g-2wpm-8h3g](https://github.com/n8n-io/n8n/security/advisories/GHSA-3p2g-2wpm-8h3g)
- [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](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)

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