---
title: "CVE-2026-100723: vm2 - Memory Corruption & Information Disclosure"
description: "vm2 before 3.12.2 contains a buffer ownership invariant bypass caused by improper handling of Buffers from host builtin modules like zlib, letting untrusted guest code read and modify host memory across sandbox boundary, exploit requires exposing Node's zlib module in NodeVM builtin allowlist."
url: https://panop.io/threat-heartbeat/CVE-2026-100723/
---

# CVE-2026-100723 vm2 - Memory Corruption & Information Disclosure

vm2 before 3.12.2 contains a buffer ownership invariant bypass caused by improper handling of Buffers from host builtin modules like zlib, letting untrusted guest code read and modify host memory across sandbox boundary, exploit requires exposing Node's zlib module in NodeVM builtin allowlist.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.32% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-100723)

## Details

Type

Memory Corruption

Impact

Information Disclosure, Data Tampering

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

Published

27 September 2026

Updated

15 October 2026

Weakness

[CWE-200](https://cwe.mitre.org/data/definitions/200.html)

## Vendor fix

Upgrade to version 3.12.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-100723](https://nvd.nist.gov/vuln/detail/CVE-2026-100723)
- [https://github.com/patriksimek/vm2/commit/4f2508abeb252aa86eb6761c78b3b000248fb089](https://github.com/patriksimek/vm2/commit/4f2508abeb252aa86eb6761c78b3b000248fb089)
- [https://github.com/patriksimek/vm2/commit/5214b02ef13b82497fcb917b45320dfd014ffd09](https://github.com/patriksimek/vm2/commit/5214b02ef13b82497fcb917b45320dfd014ffd09)
- [https://github.com/patriksimek/vm2/security/advisories/GHSA-489w-w794-jq94](https://github.com/patriksimek/vm2/security/advisories/GHSA-489w-w794-jq94)
- [https://www.vulncheck.com/advisories/vm2-before-3.12.2-memory-disclosure-via-zlib-buffer-pool](https://www.vulncheck.com/advisories/vm2-before-3.12.2-memory-disclosure-via-zlib-buffer-pool)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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