What is CVE-2026-43999?

CVE-2026-43999 is a critical-severity vulnerability in Patriksimek Vm2, classified under Incorrect Authorization. CVSS score: 9.9/10. Published 2026-05-13.

How severe is CVE-2026-43999?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Auth bypass in Patriksimek Vm2

CVE-2026-43999

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, NodeVM's builtin allowlist can be bypassed when the module builtin is allowed (including via the '*' wildcard). The module builtin exposes Node's Module._load(), which loads an…

Vulnerability class: Broken Access Control

EPSS: 0.002 (39.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Patriksimek Vm2 — versions < 3.11.0
Vm2_project Vm2

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-43999?: CVE-2026-43999 is a critical-severity vulnerability in Patriksimek Vm2, classified under Incorrect Authorization. CVSS score: 9.9/10. Published 2026-05-13.
How severe is CVE-2026-43999?: Critical severity. CVSS v3 base score is 9.9 out of 10.