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CVE-2026-77083 Details

Description

n8n is a workflow automation platform. In versions prior to 1.123.69, 2.33.4, and 2.34.1, the JavaScript Code node's VM sandbox did not freeze the sandbox's Function.prototype, allowing an authenticated user with the ability to create and execute workflows to pollute it from within a Code node execution and recover a reference to the host's globalThis, resulting in a sandbox escape. The full exploit chain additionally depends on specific modules being available as allowlisted imports in the deployment's configuration. The issue is fixed in versions 1.123.69, 2.33.4, and 2.34.1.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/n8n-io/n8n/security/advisories/GHSA-c9c6-rq46-h25v	[email protected]	MitigationVendor Advisory
https://www.vulncheck.com/advisories/n8n-before-code-node-sandbox-escape-via-function.prototype-pollution	[email protected]	Third Party 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 n8n	< 1.123.69 >= 2.0.0, < 2.33.4 2.34.0
CPE cpe:2.3:a:n8n:n8n::::::node.js::* cpe:2.3:a:n8n:n8n:2.34.0:::::node.js:: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Sep 1, 2026	Initial Analysis	[email protected]
Aug 21, 2026	CVE Modified	[email protected]
Aug 20, 2026	CVE Modified	CISA-ADP
Aug 20, 2026	New CVE Received	[email protected]