What is CVE-2026-44005?

CVE-2026-44005 is a critical-severity vulnerability in Patriksimek Vm2, classified under Code Injection. CVSS score: 10.0/10. Published 2026-05-13.

How severe is CVE-2026-44005?

Critical severity. CVSS v3 base score is 10.0 out of 10.

RCE in Patriksimek Vm2

CVE-2026-44005

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.

Vulnerability class: RCE (Remote Code Execution)

Published 2026-05-13 · last modified 2026-09-07.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (56.7th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: -0.000

Affected products

Patriksimek Vm2 — versions >= 3.9.6, < 3.11.0
Vm2 Project

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-44005?: CVE-2026-44005 is a critical-severity vulnerability in Patriksimek Vm2, classified under Code Injection. CVSS score: 10.0/10. Published 2026-05-13.
How severe is CVE-2026-44005?: Critical severity. CVSS v3 base score is 10.0 out of 10.