CVE-2026-47210

CRITICAL

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

Title source: cna
STIX 2.1

Description

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.

References (3)

Core 3

Scores

CVSS v3 9.8
EPSS 0.0088
EPSS Percentile 54.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact total

Details

CWE
CWE-913
Status published
Products (2)
npm/vm2 0 - 3.11.4npm
patriksimek/vm2 < 3.11.4
Published Jun 12, 2026
Tracked Since Jun 12, 2026