Host RCE via omitted require option
Published Jun 12, 2026 · Updated Jun 12, 2026
Sandbox escape in Patrik Simek vm2 3.11.3 and earlier allows attackers to execute arbitrary host commands through nested NodeVM creation. In lib/nodevm.js, a strict options.require === false guard runs before an omitted require option defaults to false, leaving the NESTING_OVERRIDE resolver reachable. Exploitation requires attacker-controlled JavaScript inside a NodeVM created with nesting enabled and no explicit require configuration; the inner VM can load child_process and execute commands with the host process's privileges.
Summary
What happened
Sandbox escape in Patrik Simek vm2 3.11.3 and earlier allows attackers to execute arbitrary host commands through nested NodeVM creation. In lib/nodevm.js, a strict options.require === false guard runs before an omitted require option defaults to false, leaving the NESTING_OVERRIDE resolver reachable. Exploitation requires attacker-controlled JavaScript inside a NodeVM created with nesting enabled and no explicit require configuration; the inner VM can load child_process and execute commands with the host process's privileges.
The record
- CVE
- CVE-2026-47137
- Published
- Jun 12, 2026
- Updated
- Jun 12, 2026
- Vendor
- Patrik Simek
- Product
- vm2
- Classifications
- CWE-913, T1059
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 12, 2026CVE publishedPublication date reported by the CVE source.
- Jun 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 3.11.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Maintainer NodeVM nesting bypass reproductionproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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