CVE-2026-44000 (GCVE-0-2026-44000)

Vulnerability from cvelistv5 – Published: 2026-05-13 17:23 – Updated: 2026-05-13 18:20
VLAI
Title
vm2: sandbox boundary bypass via host Promise resolution preserving host object identity
Summary
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.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 18:20 UTC
CWE
  • CWE-693 - Protection Mechanism Failure
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7962 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
patriksimek vm2 Affected: < 3.11.0
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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