n8n-io n8n up to 1.123.42/2.20.6/2.21.0 prototype pollution

Summaryinfo

A vulnerability, which was classified as critical, was found in n8n-io n8n up to 1.123.42/2.20.6/2.21.0. Affected is an unknown function. Executing a manipulation can lead to prototype pollution. This vulnerability is handled as CVE-2026-44791. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in n8n-io n8n up to 1.123.42/2.20.6/2.21.0. It has been declared as critical. This vulnerability affects some unknown functionality. The manipulation with an unknown input leads to a prototype pollution vulnerability. The CWE definition for the vulnerability is CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

n8n is an open source workflow automation platform. Prior to 1.123.43, 2.22.1, and 2.20.7, an authenticated user with permission to create or modify workflows could bypass the patch for CVE-2026-42232 in the XML node. When combined with other nodes, this could lead to RCE on the n8n host. This vulnerability is fixed in 1.123.43, 2.22.1, and 2.20.7.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-44791 since 05/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 1.123.43, 2.20.7 or 2.21.1 eliminates this vulnerability.

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Productinfo

Vendor

• n8n-io

Name

• n8n

Version

• 1.123.0
• 1.123.1
• 1.123.2
• 1.123.3
• 1.123.4
• 1.123.5
• 1.123.6
• 1.123.7
• 1.123.8
• 1.123.9
• 1.123.10
• 1.123.11
• 1.123.12
• 1.123.13
• 1.123.14
• 1.123.15
• 1.123.16
• 1.123.17
• 1.123.18
• 1.123.19
• 1.123.20
• 1.123.21
• 1.123.22
• 1.123.23
• 1.123.24
• 1.123.25
• 1.123.26
• 1.123.27
• 1.123.28
• 1.123.29
• 1.123.30
• 1.123.31
• 1.123.32
• 1.123.33
• 1.123.34
• 1.123.35
• 1.123.36
• 1.123.37
• 1.123.38
• 1.123.39
• 1.123.40
• 1.123.41
• 1.123.42
• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.20.0
• 2.20.1
• 2.20.2
• 2.20.3
• 2.20.4
• 2.20.5
• 2.20.6
• 2.21.0

Website

• Product: https://github.com/n8n-io/n8n/

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