CVE-2026-44000: CWE-693: Protection Mechanism Failure in patriksimek vm2
CVE-2026-44000 is a vulnerability in the vm2 Node.js sandbox prior to version 3.11.0 that allows host object identity to leak into the sandbox via host Promise resolution. This occurs because the Promise fulfillment wrapper uses ensureThis() instead of a stronger cross-realm conversion, enabling sandbox code to directly interact with host objects, including identity checks and state mutation. The vulnerability is fixed in vm2 version 3.11.0. The CVSS 3.1 base score is 6.
AI Analysis
Technical Summary
The vm2 sandbox for Node.js versions before 3.11.0 contains a protection mechanism failure (CWE-693) where host objects resolved by Promises can cross the sandbox boundary without proper isolation. This happens because the Promise fulfillment wrapper uses ensureThis(), which returns the original host object if no prototype mapping is found, instead of using a stronger cross-realm conversion path (from()/proxy wrapping). Consequently, sandboxed code can access and mutate host objects directly, breaking the intended isolation. This vulnerability was addressed and fixed in vm2 version 3.11.0.
Potential Impact
Exploitation of this vulnerability allows sandboxed code to bypass isolation boundaries and interact directly with host objects, including performing identity checks and mutating host object state. This could lead to unauthorized access or modification of host environment data from within the sandbox. The impact is limited to confidentiality and integrity, with no direct availability impact reported. The CVSS score of 6.5 reflects a medium severity level.
Mitigation Recommendations
This vulnerability is fixed in vm2 version 3.11.0. Users should upgrade to version 3.11.0 or later to remediate this issue. Patch status is not explicitly stated beyond the fix in 3.11.0, so verifying the upgrade and consulting the official vm2 repository or vendor advisory for confirmation is recommended.
CVE-2026-44000: CWE-693: Protection Mechanism Failure in patriksimek vm2
Description
CVE-2026-44000 is a vulnerability in the vm2 Node.js sandbox prior to version 3.11.0 that allows host object identity to leak into the sandbox via host Promise resolution. This occurs because the Promise fulfillment wrapper uses ensureThis() instead of a stronger cross-realm conversion, enabling sandbox code to directly interact with host objects, including identity checks and state mutation. The vulnerability is fixed in vm2 version 3.11.0. The CVSS 3.1 base score is 6.
CVSS v3.1
Score 6.5medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vm2 sandbox for Node.js versions before 3.11.0 contains a protection mechanism failure (CWE-693) where host objects resolved by Promises can cross the sandbox boundary without proper isolation. This happens because the Promise fulfillment wrapper uses ensureThis(), which returns the original host object if no prototype mapping is found, instead of using a stronger cross-realm conversion path (from()/proxy wrapping). Consequently, sandboxed code can access and mutate host objects directly, breaking the intended isolation. This vulnerability was addressed and fixed in vm2 version 3.11.0.
Potential Impact
Exploitation of this vulnerability allows sandboxed code to bypass isolation boundaries and interact directly with host objects, including performing identity checks and mutating host object state. This could lead to unauthorized access or modification of host environment data from within the sandbox. The impact is limited to confidentiality and integrity, with no direct availability impact reported. The CVSS score of 6.5 reflects a medium severity level.
Mitigation Recommendations
This vulnerability is fixed in vm2 version 3.11.0. Users should upgrade to version 3.11.0 or later to remediate this issue. Patch status is not explicitly stated beyond the fix in 3.11.0, so verifying the upgrade and consulting the official vm2 repository or vendor advisory for confirmation is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-04T20:24:31.918Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a04ba1fcbff5d8610f48259
Added to database: 05/13/2026, 17:51:27 UTC
Last enriched: 05/20/2026, 19:12:15 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 66
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