---
title: "CVE-2026-92947: vm2: Sandboxed code can read and write host-realm memory via Node's shared Buffer pool"
url: https://erroneo.us/security/cve/CVE-2026-92947/
description: "CVE-2026-92947 (vm2 (npm)): vm2 before 3.11.7 exposes Node's shared Buffer pool to sandboxed code, allowing disclosure of host memory used by Buffer.from…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-09-17
date_modified: 2026-10-07
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-92947"
kev: false
cvss: 10
epss: 0.00482
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-92947: vm2: Sandboxed code can read and write host-realm memory via Node's shared Buffer pool

**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 0.5% , percentile 41: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 41% of all scored CVEs (low). 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) <= 3.11.6, fixed in 3.11.7 . 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 before 3.11.7 exposes Node's shared Buffer pool to sandboxed code, allowing disclosure of host memory used by Buffer.from, Buffer.concat, and related allocations. Sandboxed code can read and write to host-realm buffers by acquiring ArrayBuffers from small allocations, leading to sensitive data exposure and potential denial-of-service.

## Affected packages

- npm `vm2` <= 3.11.6 → fixed: 3.11.7

## Affected products (CVE record)

- patriksimek vm2: < 3.11.7

## Severity

- VulnCheck CVSS 4.0: 10 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L`
- VulnCheck CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L`
- GitHub CVSS 3.1: 10.0 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L`

## 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): 0.48% probability of exploitation activity in the next 30 days; percentile 41.

## Sources

- [GitHub Security Advisory (GHSA-fcqc-726x-5wfc)](https://github.com/patriksimek/vm2/security/advisories/GHSA-fcqc-726x-5wfc)
- [GitHub Advisory GHSA-fcqc-726x-5wfc](https://github.com/advisories/GHSA-fcqc-726x-5wfc)
- [CVE.org record CVE-2026-92947](https://www.cve.org/CVERecord?id=CVE-2026-92947)
- [NVD entry CVE-2026-92947](https://nvd.nist.gov/vuln/detail/CVE-2026-92947)
- [VulnCheck Advisory: vm2 before 3.11.7 Memory Disclosure via Buffer Pool](https://www.vulncheck.com/advisories/vm2-before-3.11.7-memory-disclosure-via-buffer-pool)
- [github.com](https://github.com/patriksimek/vm2/commit/4f2508abeb252aa86eb6761c78b3b000248fb089)
- [github.com](https://github.com/patriksimek/vm2/releases/tag/v3.11.7)

---
Source page: https://erroneo.us/security/cve/CVE-2026-92947/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt