GHSA-9538-79j2-h62h

Source

https://github.com/advisories/GHSA-9538-79j2-h62h

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-9538-79j2-h62h/GHSA-9538-79j2-h62h.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-9538-79j2-h62h

Withdrawn

2026-10-05T22:47:22Z

Published

2026-09-17T15:32:16Z

Modified

2026-10-05T23:00:05Z

Severity

7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H CVSS Calculator
7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator

Summary

Duplicate Advisory: `allowAsync: false` can be bypassed through Promise thenable assimilation in VM and NodeVM

Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-f8gf-w286-fmq2. This link is maintained to preserve external references.

Original Description

vm2 before 3.11.8 does not fully enforce the allowAsync: false option in VM and NodeVM. While localPromise.prototype.then is replaced with a handler that throws 'Async not available', the sandbox's Promise static methods (Promise.resolve, Promise.all, Promise.race, Promise.any, and Promise.allSettled) still assimilate attacker-supplied thenables: native promise resolution performs PromiseResolveThenableJob and invokes the sandboxed code's then method in a microtask without passing through the patched then, so the async restriction is never applied. As a result, sandboxed script can schedule work that runs after VM.run() or NodeVM.run() has returned and outside the configured timeout, continuing to execute after the host believes execution is complete.

Database specific

{
    "cwe_ids": [
        "CWE-693"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-05T22:47:22Z",
    "nvd_published_at": "2026-09-17T14:18:02Z",
    "severity": "HIGH"
}

References

Affected packages

npm / vm2

Package

Name: vm2; View open source insights on deps.dev
Purl: pkg:npm/vm2

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Last Affected

3.11.7

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-9538-79j2-h62h/GHSA-9538-79j2-h62h.json"