CVE-2026-43999
vm2: NodeVM builtin allowlist bypass via `module` builtin's `Module._load` allows sandbox escape
CVSS Score
9.9
EPSS Score
1.0%
EPSS Percentile
59th
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.
| CWE | CWE-863 |
| Vendor | patriksimek |
| Product | vm2 |
| Published | May 13, 2026 |
| Last Updated | Aug 6, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
patriksimek / vm2
< 3.11.0
References
github.com: https://github.com/patriksimek/vm2/security/advisories/GHSA-947f-4v7f-x2v8 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-43999 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2477196 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43999.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50850