CVE-2026-43999
Critical · CVSS 9.9vm2 — Sandbox escape via builtin allowlist bypass leading to RCE
- CVSS
- 9.9
- nvd
- EPSS
- 0.97%
- 59th pct
- KEV
- No
- Class
- oss containerizable
- CWE-863, CWE-829
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.
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Heuristic ranking — not yet expert-vetted. Scored on structure + provenance, not execution.
- ★ 0
Recall-favoring discovery; ranking by the Stage-4 scorer (Adam's rubric). Scanner/aggregator repos are hidden.
Affected packages
| npm | vm2 | 3.10.5 → 3.11.0 |
References
- https://github.com/patriksimek/vm2/security/advisories/GHSA-947f-4v7f-x2v8
- https://access.redhat.com/errata/RHSA-2026:50850
- https://access.redhat.com/security/cve/CVE-2026-43999
- https://bugzilla.redhat.com/show_bug.cgi?id=2477196
- https://github.com/patriksimek/vm2/security/advisories/GHSA-947f-4v7f-x2v8
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43999.json
Status: enriched · ingested 2026-06-30T06:00:22.000Z · profiled 2026-07-01T12:30:14.000Z