CVE-2026-47210

CRITICAL 9.8

vm2 sandbox escape via JSPI-backed Promise `.finally()` species bypass

CVSS Score

9.8

EPSS Score

0.1%

EPSS Percentile

29th

vm2 is an open source vm/sandbox for Node.js. Prior to version 3.11.4, a sandbox escape vulnerability in vm2 allows arbitrary code execution in the host process when untrusted code is executed with async support on runtimes exposing WebAssembly JSPI (WebAssembly.promising / WebAssembly.Suspending). In the tested configuration, a JSPI-backed Promise can reach Promise.prototype.finally() in a way that bypasses the expected Promise-species hardening and exposes a host-originated rejection object to attacker-controlled species logic, breaking the sandbox boundary. This issue has been patched in version 3.11.4.

CWE	CWE-913
Vendor	patriksimek
Product	vm2
Published	Jun 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

patriksimek / vm2

< 3.11.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/patriksimek/vm2/security/advisories/GHSA-6j2x-vhqr-qr7q github.com: https://github.com/patriksimek/vm2/commit/6915fa4d9bcebd47b9a4f39a1adc1aa94ef6ffc6 github.com: https://github.com/patriksimek/vm2/releases/tag/v3.11.4