CVE-2026-47210 vm2 sandbox escape via JSPI-backed Promise `.finally()` species bypass

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...

CVE-2026-47210

Summary : CVE-2026-47210 affects the vm2 sandbox prior to version 3.11.4, where a JSPI-backed Promise pathway can bypass Promise species hardening via WebAssembly.promising/WebAssembly.Suspending, potentially exposing a host-originated rejection object to attacker-controlled logic and breaking sa...

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

Summary 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...