Internal security-function disclosure via transformer fast path
Published May 13, 2026 · Updated May 13, 2026
Protection mechanism failure in vm2 before 3.11.0 allows remote attackers to access internal sandbox security functions through crafted code. In lib/transformer.js, a regex fast path returns source unchanged when it lacks catch, import, and async, skipping the AST visitor that rejects the internal-state identifier. All applications using vm2 are exposed without special configuration, but the disclosed methods are defensive utilities rather than direct sandbox-escape primitives.
Summary
What happened
Protection mechanism failure in vm2 before 3.11.0 allows remote attackers to access internal sandbox security functions through crafted code. In lib/transformer.js, a regex fast path returns source unchanged when it lacks catch, import, and async, skipping the AST visitor that rejects the internal-state identifier. All applications using vm2 are exposed without special configuration, but the disclosed methods are defensive utilities rather than direct sandbox-escape primitives.
The record
- CVE
- CVE-2026-44003
- Published
- May 13, 2026
- Updated
- May 13, 2026
- Vendor
- Patrik Simek
- Product
- vm2
- Classifications
- CWE-693
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 13, 2026CVE publishedPublication date reported by the CVE source.
- May 13, 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=< 3.11.0
What conditions does exploitation require?
What is affected?
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 library-level internal-state access proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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