---
title: "CVE-2026-92959: vm2 - Asynchronous Execution Bypass"
description: "vm2 before 3.11.8 contains an asynchronous execution bypass caused by incomplete enforcement of the allowAsync: false option in VM and NodeVM, letting sandboxed scripts execute code after VM.run() returns, exploit requires sandboxed code execution."
url: https://panop.io/threat-heartbeat/CVE-2026-92959/
---

# CVE-2026-92959 vm2 - Asynchronous Execution Bypass

vm2 before 3.11.8 contains an asynchronous execution bypass caused by incomplete enforcement of the allowAsync: false option in VM and NodeVM, letting sandboxed scripts execute code after VM.run() returns, exploit requires sandboxed code execution.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.45% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-92959)

## Details

Type

Asynchronous Execution Bypass

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Published

17 September 2026

Updated

15 October 2026

Weakness

[CWE-693](https://cwe.mitre.org/data/definitions/693.html)

## Vendor fix

Update to version 3.11.8 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-92959](https://nvd.nist.gov/vuln/detail/CVE-2026-92959)
- [https://www.vulncheck.com/advisories/vm2-before-3.11.8-allowasync-bypass-via-promise-thenable](https://www.vulncheck.com/advisories/vm2-before-3.11.8-allowasync-bypass-via-promise-thenable)
- [https://github.com/patriksimek/vm2/security/advisories/GHSA-f8gf-w286-fmq2](https://github.com/patriksimek/vm2/security/advisories/GHSA-f8gf-w286-fmq2)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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