---
title: "CVE-2026-47698: vm2: Sandbox Breakout Using Dangerous Host Proto Mutators"
url: https://erroneo.us/security/cve/CVE-2026-47698/
description: "CVE-2026-47698 (vm2 (npm)): vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.6, lib/bridge.js and lib/setup-sandbox.js fail to block stacked…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-17
date_modified: 2026-10-07
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-47698"
kev: false
cvss: 9.8
epss: 0.00971
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-47698: vm2: Sandbox Breakout Using Dangerous Host Proto Mutators

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 1.0% , percentile 62: FIRST’s model estimates a 1.0% chance of exploitation activity in the next 30 days, higher than 62% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes vm2 (npm) <= 3.11.5, fixed in 3.11.6 . Check your lockfile, including transitive dependencies.
- Editorial verdict: Check exposure. vm2: 22 Critical Sandbox Escapes, Fixed in 3.12.2 — If anything outside your trust boundary can get code into vm2, upgrade to 3.12.2 today and plan to move that code out of process; if vm2 only runs your own code, upgrade on a normal cycle.

## What it is

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.6, lib/bridge.js and lib/setup-sandbox.js fail to block stacked indirection through Function.prototype.call around dangerous host prototype getter and setter mutators, allowing sandbox code to sever a host intrinsic's prototype chain and reach e.constructor.constructor for arbitrary host command execution. This issue is fixed in version 3.11.6.

## Affected packages

- npm `vm2` <= 3.11.5 → fixed: 3.11.6

## Affected products (CVE record)

- patriksimek vm2: < 3.11.6

## Severity

- GitHub_M CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.97% probability of exploitation activity in the next 30 days; percentile 62.

## Sources

- [GitHub Advisory GHSA-cfcw-xp6x-25gj](https://github.com/advisories/GHSA-cfcw-xp6x-25gj)
- [CVE.org record CVE-2026-47698](https://www.cve.org/CVERecord?id=CVE-2026-47698)
- [NVD entry CVE-2026-47698](https://nvd.nist.gov/vuln/detail/CVE-2026-47698)
- [github.com](https://github.com/patriksimek/vm2/security/advisories/GHSA-cfcw-xp6x-25gj)
- [github.com](https://github.com/patriksimek/vm2/commit/a85acb61f81402c6eabf32760aa11272af6d0f9e)
- [github.com](https://github.com/patriksimek/vm2/releases/tag/3.11.6)

---
Source page: https://erroneo.us/security/cve/CVE-2026-47698/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt