---
title: "CVE-2026-92953: vm2: Default VM can mutate host TypedArray and ArrayBuffer intrinsics after the host-prototype pollution fix"
url: https://erroneo.us/security/cve/CVE-2026-92953/
description: "CVE-2026-92953 (vm2 (npm)): vm2 versions from 3.11.0 before 3.11.8 fail to protect host TypedArray and ArrayBuffer prototypes from sandbox mutation.…"
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-2026-92953"
kev: false
cvss: 9.3
epss: 0.00501
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-92953: vm2: Default VM can mutate host TypedArray and ArrayBuffer intrinsics after the host-prototype pollution fix

**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 42: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 42% 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) >= 3.11.0, <= 3.11.7, fixed in 3.11.8 . 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 versions from 3.11.0 before 3.11.8 fail to protect host TypedArray and ArrayBuffer prototypes from sandbox mutation. Attackers can use prototype-walking primitives to reach and modify host Uint8Array.prototype, %TypedArray%.prototype, and ArrayBuffer.prototype, causing host-created typed arrays to observe attacker-controlled properties after VM.run() returns.

## Affected packages

- npm `vm2` >= 3.11.0, <= 3.11.7 → fixed: 3.11.8

## Affected products (CVE record)

- patriksimek vm2: 3.11.0 < 3.11.8

## Severity

- VulnCheck CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H`
- VulnCheck CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H`
- GitHub CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.50% probability of exploitation activity in the next 30 days; percentile 42.

## Sources

- [GitHub Security Advisory (GHSA-3vgf-8m4q-q4qr)](https://github.com/patriksimek/vm2/security/advisories/GHSA-3vgf-8m4q-q4qr)
- [GitHub Advisory GHSA-3vgf-8m4q-q4qr](https://github.com/advisories/GHSA-3vgf-8m4q-q4qr)
- [CVE.org record CVE-2026-92953](https://www.cve.org/CVERecord?id=CVE-2026-92953)
- [NVD entry CVE-2026-92953](https://nvd.nist.gov/vuln/detail/CVE-2026-92953)
- [VulnCheck Advisory: vm2 3.11.0 through 3.11.7 Prototype Pollution via TypedArray](https://www.vulncheck.com/advisories/vm2-3.11.0-through-3.11.7-prototype-pollution-via-typedarray)
- [github.com](https://github.com/patriksimek/vm2/commit/92a10fca7b3ca63bb1574b6795540264f6805b30)
- [github.com](https://github.com/patriksimek/vm2/releases/tag/v3.11.8)

---
Source page: https://erroneo.us/security/cve/CVE-2026-92953/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt