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Vulnerability · Published May 13, 2026 · Assigned by GitHub_M

CVE-2026-44005vm2: Sandbox escape

Critical 10.0

In plain English

A critical-severity prototype pollution in vm2 from patriksimek. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)10.0Critical
Exploit odds (30 days)0.8%top 42.2% 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. From 3.9.6 to 3.10.5, vm2's bridge exposes mutable proxies for real host-realm intrinsic prototypes and then forwards sandbox writes into the underlying host objects with otherReflectSet() and otherReflectDefineProperty(), which lets attacker-controlled JavaScript running in a default VM or inherited NodeVM mutate shared host Object.prototype, Array.prototype, and Function.prototype from inside the sandbox This vulnerability is fixed in 3.11.0.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmvm23.11.0GHSA-vwrp-x96c-mhwq

Affected products (as reported)

VendorProductVersions
patriksimek vm2 >= 3.9.6, < 3.11.0

Weakness: CWE-1321, CWE-94, CWE-653 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H

References