What’s Vulnerable › Vulnerabilities

CVE-2026-44005: vm2: Sandbox escape

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-13 · updated 2026-10-26
• Weakness: CWE-94

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 products

• patriksimek vm2: from 3.9.6 before 3.11.0 — fixed in 3.11.0

How to fix

Upgrade to a fixed version: patriksimek vm2 3.11.0. Check the vendor advisory for mitigations.

References

• https://github.com/patriksimek/vm2/security/advisories/GHSA-vwrp-x96c-mhwq
• https://access.redhat.com/errata/RHSA-2026:50850
• https://access.redhat.com/security/cve/CVE-2026-44005
• https://bugzilla.redhat.com/show_bug.cgi?id=2477205
• https://github.com/patriksimek/vm2/security/advisories/GHSA-vwrp-x96c-mhwq
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44005.json

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