CVE-2026-43999

Summary

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.

Affected Software

Weaknesses

• CWE-863: CWE-863: Incorrect Authorization

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

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

vm2: vm2: Remote code execution via NodeVM builtin allowlist bypass

Additional References

• https://access.redhat.com/security/cve/CVE-2026-43999
• https://bugzilla.redhat.com/show_bug.cgi?id=2477196
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43999.json

References

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

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