n8n-io n8n up to 2.42.5/2.43.2/3.0.0 Function/Function Item/LangChain Code code injection

Summaryinfo

A vulnerability has been found in n8n-io n8n up to 2.42.5/2.43.2/3.0.0 and classified as critical. Impacted is an unknown function of the component Function/Function Item/LangChain Code. The manipulation leads to code injection. This vulnerability is referenced as CVE-2026-119408. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in n8n-io n8n up to 2.42.5/2.43.2/3.0.0. This issue affects an unknown part of the component Function/Function Item/LangChain Code. The manipulation with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

n8n before 2.42.6, 2.43.x before 2.43.3, and 3.x before 3.0.1 contains a remote code execution vulnerability via deprecated Function, Function Item, and LangChain Code nodes running outside task runner isolation. Authenticated users who can create, modify, or import workflows naming these hidden node types can execute JavaScript in the n8n main process.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-119408 since 10/30/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059 for this issue.

Upgrading to version 2.42.6, 2.43.3 or 3.0.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-4192). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

• n8n n8n

Productinfo

Vendor

• n8n-io

Name

• n8n

Version

• 2.42.0
• 2.42.1
• 2.42.2
• 2.42.3
• 2.42.4
• 2.42.5
• 2.43.0
• 2.43.1
• 2.43.2
• 3.0

Website

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

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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