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Vulnerability · Published May 13, 2026 · Assigned by GitHub_M

CVE-2026-44008vm2 has sandbox breakout via `neutralizeArraySpeciesBatch`

Critical 9.8

In plain English

A critical-severity security flaw in vm2 from patriksimek. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.9%top 40.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.2, the new method neutralizeArraySpeciesBatch works with objects from the other side but can call into this side via getter on the array prototype exposing objects of the wrong side into the sandbox. This can be used to get host objects and get the host Function object. This allows attackers to write code which can escape from the VM2 sandbox and execute arbitrary commands on the host system. This vulnerability is fixed in 3.11.2.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmvm23.11.2GHSA-9qj6-qjgg-37qq

Affected products (as reported)

VendorProductVersions
patriksimek vm2 < 3.11.2

Weakness: CWE-668, CWE-1100 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References