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Vulnerability Details :

CVE-2026-44000

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-13 May, 2026 | 17:23
Updated At-13 May, 2026 | 18:20
Rejected At-
Credits

vm2: sandbox boundary bypass via host Promise resolution preserving host object identity

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, a sandbox boundary violation in vm2 allows host object identity to cross into the sandbox through host Promise resolution. When a host-side Promise that resolves to a host object is exposed to the sandbox, the value delivered to the sandbox .then() callback preserves host identity. This allows the sandbox to interact with the host object directly, including performing identity checks using host-side WeakMap and mutating host object state from inside the sandbox. This behavior occurs because the Promise fulfillment wrapper uses ensureThis() instead of the stronger cross-realm conversion path (from() / proxy wrapping). If no prototype mapping is found, ensureThis() returns the original object. As a result, objects resolved by host Promises can cross the sandbox boundary without proper isolation. This vulnerability is fixed in 3.11.0.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–ĽCommon Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:13 May, 2026 | 17:23
Updated At:13 May, 2026 | 18:20
Rejected At:
â–ĽCVE Numbering Authority (CNA)
vm2: sandbox boundary bypass via host Promise resolution preserving host object identity

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, a sandbox boundary violation in vm2 allows host object identity to cross into the sandbox through host Promise resolution. When a host-side Promise that resolves to a host object is exposed to the sandbox, the value delivered to the sandbox .then() callback preserves host identity. This allows the sandbox to interact with the host object directly, including performing identity checks using host-side WeakMap and mutating host object state from inside the sandbox. This behavior occurs because the Promise fulfillment wrapper uses ensureThis() instead of the stronger cross-realm conversion path (from() / proxy wrapping). If no prototype mapping is found, ensureThis() returns the original object. As a result, objects resolved by host Promises can cross the sandbox boundary without proper isolation. This vulnerability is fixed in 3.11.0.

Affected Products
Vendor
patriksimek
Product
vm2
Versions
Affected
  • < 3.11.0
Problem Types
TypeCWE IDDescription
CWECWE-693CWE-693: Protection Mechanism Failure
Type: CWE
CWE ID: CWE-693
Description: CWE-693: Protection Mechanism Failure
Metrics
VersionBase scoreBase severityVector
3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/patriksimek/vm2/security/advisories/GHSA-mpf8-4hx2-7cjg
x_refsource_CONFIRM
Hyperlink: https://github.com/patriksimek/vm2/security/advisories/GHSA-mpf8-4hx2-7cjg
Resource:
x_refsource_CONFIRM
â–ĽAuthorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/patriksimek/vm2/security/advisories/GHSA-mpf8-4hx2-7cjg
exploit
Hyperlink: https://github.com/patriksimek/vm2/security/advisories/GHSA-mpf8-4hx2-7cjg
Resource:
exploit
Information is not available yet
â–ĽNational Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:13 May, 2026 | 18:16
Updated At:13 May, 2026 | 19:17

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, a sandbox boundary violation in vm2 allows host object identity to cross into the sandbox through host Promise resolution. When a host-side Promise that resolves to a host object is exposed to the sandbox, the value delivered to the sandbox .then() callback preserves host identity. This allows the sandbox to interact with the host object directly, including performing identity checks using host-side WeakMap and mutating host object state from inside the sandbox. This behavior occurs because the Promise fulfillment wrapper uses ensureThis() instead of the stronger cross-realm conversion path (from() / proxy wrapping). If no prototype mapping is found, ensureThis() returns the original object. As a result, objects resolved by host Promises can cross the sandbox boundary without proper isolation. This vulnerability is fixed in 3.11.0.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Type: Secondary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-693Secondarysecurity-advisories@github.com
CWE ID: CWE-693
Type: Secondary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/patriksimek/vm2/security/advisories/GHSA-mpf8-4hx2-7cjgsecurity-advisories@github.com
N/A
https://github.com/patriksimek/vm2/security/advisories/GHSA-mpf8-4hx2-7cjg134c704f-9b21-4f2e-91b3-4a467353bcc0
N/A
Hyperlink: https://github.com/patriksimek/vm2/security/advisories/GHSA-mpf8-4hx2-7cjg
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/patriksimek/vm2/security/advisories/GHSA-mpf8-4hx2-7cjg
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource: N/A

Change History

0
Information is not available yet

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CWE ID-CWE-693
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Details not found