What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-12 · updated 2026-10-26
• Weakness: CWE-913

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.

Affected products

• patriksimek vm2: before 3.11.4

References

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

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