What’s Vulnerable › Vulnerabilities

CVE-2026-44003: vm2: Transformer Fast-Path Bypass Exposes Internal State Variable

• Severity: medium (CVSS 5.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-13 · updated 2026-10-26
• Weakness: CWE-693

Description

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.

Affected products

• patriksimek vm2: 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-wp5r-2gw5-m7q7
• https://github.com/patriksimek/vm2/security/advisories/GHSA-wp5r-2gw5-m7q7

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