patriksimek vm2 up to 3.11.3 Stack Trace Preparation lib/setup-sandbox.js defaultSandboxPrepareStackTrace information disclosure

Summaryinfo

A vulnerability classified as problematic was found in patriksimek vm2 up to 3.11.3. This impacts the function defaultSandboxPrepareStackTrace of the file lib/setup-sandbox.js of the component Stack Trace Preparation. Such manipulation leads to information disclosure. This vulnerability is listed as CVE-2026-92962. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in patriksimek vm2 up to 3.11.3. It has been rated as problematic. Affected by this issue is the function defaultSandboxPrepareStackTrace of the file lib/setup-sandbox.js of the component Stack Trace Preparation. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

vm2 is a sandbox for running untrusted JavaScript. In vm2 versions up to and including 3.11.3, the defaultSandboxPrepareStackTrace function in lib/setup-sandbox.js builds its output array using prototype-walking index assignment (lines[lines.length] = value) rather than a prototype-bypassing define-property primitive. Because this bridge-internal array is allocated in the sandbox realm, code inside the sandbox can install an accessor on Array.prototype for the relevant index; the accessor is then invoked whenever the sandbox reads error.stack (or otherwise triggers Error.prepareStackTrace), allowing sandbox code to observe and intercept each stack-trace line written by the bridge. The same pattern is used in the error-handling (catch) branch. The values written are formatted strings only, so the practical impact is limited to an information side channel and a violation of vm2's bridge-container defense invariant rather than a sandbox escape; the vendor rates the issue Low. The issue is fixed in vm2 3.11.4, which installs each entry as an own data property via Reflect.defineProperty.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-92962 since 09/17/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 3.11.4 eliminates this vulnerability.

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Productinfo

Vendor

• patriksimek

Name

• vm2

Version

• 3.11.0
• 3.11.1
• 3.11.2
• 3.11.3

Website

• Product: https://github.com/patriksimek/vm2/

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