What is CVE-2026-44003?

CVE-2026-44003 is a medium-severity vulnerability in Patriksimek Vm2, classified under Protection Mechanism Failure. CVSS score: 5.3/10. Published 2026-05-13.

How severe is CVE-2026-44003?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Patriksimek Vm2

CVE-2026-44003

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, vm2's code transformer has a performance optimization that skips AST analysis when the code does not contain catch, import, or async keywords. This fast-path bypass allows sandboxed code to directly access the internal VM2_INTERNAL_STATE_DO_NOT_USE_OR_PROGRAM_WILL_FAIL variable, which exposes internal security functions (handleException, wrapWith, import). This vulnerability is fixed in 3.11.0.

Published 2026-05-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (26.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001

Affected products

Patriksimek Vm2 — versions < 3.11.0
Vm2 Project

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

References

github.com/patriksimek/vm2/security/advisories/GHSA-wp5r-2gw5-m7q7 (Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-44003?: CVE-2026-44003 is a medium-severity vulnerability in Patriksimek Vm2, classified under Protection Mechanism Failure. CVSS score: 5.3/10. Published 2026-05-13.
How severe is CVE-2026-44003?: Medium severity. CVSS v3 base score is 5.3 out of 10.