CVE-2026-47135: CWE-693: Protection Mechanism Failure in patriksimek vm2
vm2 is an open source vm/sandbox for Node.js. Prior to version 3.11.4, Symbol.for override in setup-sandbox.js only intercepts 2 of 9 dangerous Node.js cross-realm symbols. Combined with the bridge's set/defineProperty/deleteProperty traps having no isDangerousCrossRealmSymbol key check, sandbox code can obtain real cross-realm symbols, write them to host objects, and control host-side behavior — verified with a full util.promisify hijack chain. This issue has been patched in version 3.11.4.
AI Analysis
Technical Summary
The vm2 Node.js sandbox prior to version 3.11.4 fails to fully intercept dangerous cross-realm symbols, specifically only intercepting 2 of 9 such symbols in setup-sandbox.js. The bridge's traps for set, defineProperty, and deleteProperty lack checks for dangerous cross-realm symbols, enabling sandboxed code to obtain and write real cross-realm symbols to host objects. This flaw allows control over host-side behavior, demonstrated by a full util.promisify hijack chain. The issue is addressed in vm2 version 3.11.4.
Potential Impact
Exploitation of this vulnerability can lead to sandbox escape where malicious code running inside the vm2 sandbox can manipulate host objects and control host-side behavior, resulting in high confidentiality and integrity impact. Availability is not affected. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade vm2 to version 3.11.4 or later, where this vulnerability has been patched. No other mitigation is indicated by the vendor advisory.
CVE-2026-47135: CWE-693: Protection Mechanism Failure in patriksimek vm2
Description
vm2 is an open source vm/sandbox for Node.js. Prior to version 3.11.4, Symbol.for override in setup-sandbox.js only intercepts 2 of 9 dangerous Node.js cross-realm symbols. Combined with the bridge's set/defineProperty/deleteProperty traps having no isDangerousCrossRealmSymbol key check, sandbox code can obtain real cross-realm symbols, write them to host objects, and control host-side behavior — verified with a full util.promisify hijack chain. This issue has been patched in version 3.11.4.
CVSS v3.1
Score 8.7high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vm2 Node.js sandbox prior to version 3.11.4 fails to fully intercept dangerous cross-realm symbols, specifically only intercepting 2 of 9 such symbols in setup-sandbox.js. The bridge's traps for set, defineProperty, and deleteProperty lack checks for dangerous cross-realm symbols, enabling sandboxed code to obtain and write real cross-realm symbols to host objects. This flaw allows control over host-side behavior, demonstrated by a full util.promisify hijack chain. The issue is addressed in vm2 version 3.11.4.
Potential Impact
Exploitation of this vulnerability can lead to sandbox escape where malicious code running inside the vm2 sandbox can manipulate host objects and control host-side behavior, resulting in high confidentiality and integrity impact. Availability is not affected. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade vm2 to version 3.11.4 or later, where this vulnerability has been patched. No other mitigation is indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-18T19:50:18.695Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a2c1a23e617e2d8347eb1d1
Added to database: 06/12/2026, 14:39:31 UTC
Last enriched: 06/19/2026, 18:23:28 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 52
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