---
id: CVE-2026-92958
title: vm2 through 3.11.6 contains a builtin-module denylist bypass in NodeVM
summary: >-
  vm2 through 3.11.6 contains a builtin-module denylist bypass in NodeVM. When
  the embedder uses the builtin wildcard together with negative entries (e.g.
  require: { builtin: ['*', '-fs', '-child_process'] }), negative entries are
  matched …
severity: high
cvss: 8.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L'
cwe:
  - CWE-269
  - CWE-1220
vendor: patriksimek
product: vm2
affected:
  - vm2 < 3.11.7
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:17:31.243'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92958'
references:
  - url: 'https://github.com/patriksimek/vm2/security/advisories/GHSA-6rh5-qq4q-97xh'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/vm2-before-3.11.7-denylist-bypass-via-fs-promises
    label: disclosure@vulncheck.com
  - url: 'https://github.com/patriksimek/vm2/security/advisories/GHSA-6rh5-qq4q-97xh'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92958.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-92958'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536039'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-92958'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92958'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T19:35:41.669234Z'
epss: 0.00384
epssPercentile: 0.29665
ingestedAt: '2026-09-17T14:19:30.991Z'
---

## Overview

vm2 through 3.11.6 contains a builtin-module denylist bypass in NodeVM. When the embedder uses the builtin wildcard together with negative entries (e.g. require: { builtin: ['*', '-fs', '-child_process'] }), negative entries are matched by exact module name in lib/builtin.js, so -fs removes only the builtin named fs and does not remove builtin subpaths such as fs/promises. Sandboxed code can therefore call require('fs/promises') or require('node:fs/promises') and reach the promise-based filesystem API despite fs being denied; node: prefix handling is likewise inconsistent (a -node:fs/promises entry does not block require('fs/promises')). Host file creation and writing were confirmed via fsp.writeFile(), and other fs/promises operations (cp, mkdir, rename, rm, rmdir, truncate, read operations, etc.) are also reachable. This issue is fixed in vm2 3.11.7.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Developer Hub, Self-service automation portal 2 · no fix planned: Red Hat Developer Hub, Self-service automation portal 2 · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92958.json)