CVE-2026-43999

Description

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 any module by name directly in the host context, completely bypassing vm2's builtin restriction. This allows sandboxed code to load excluded builtins like child_process and achieve remote code execution. This vulnerability is fixed in 3.11.0.

CVSS v3.1 Score

9.9

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.39%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-863 Incorrect Authorization

Affected Products

Vendor	Product	Versions
vm2_project	vm2	< 3.11.0

References

Advisories & Patches

https://github.com/patriksimek/vm2/security/advisories/GHSA-947f-4v7f-x2v8 https://github.com/patriksimek/vm2/security/advisories/GHSA-947f-4v7f-x2v8

Exploits

https://github.com/patriksimek/vm2/security/advisories/GHSA-947f-4v7f-x2v8 https://github.com/patriksimek/vm2/security/advisories/GHSA-947f-4v7f-x2v8

Frequently Asked Questions

What is 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 any module by name directly in the host context, completely bypassing vm2's builtin restriction. This allows sandboxed code to load excluded builtins like child_process and achieve remote code execution. This vulnerability is fixed in 3.11.0. It has a CVSS v3.1 base score of 9.9 (CRITICAL).

How severe is CVE-2026-43999? +

CVE-2026-43999 has a CVSS v3.1 score of 9.9 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0018, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-43999? +

CVE-2026-43999 affects products from vm2_project, specifically: vm2. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-43999? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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