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CVE

CVE-2026-47210

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

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). 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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Related Resources

No items found.

References

https://github.com/patriksimek/vm2/releases/tag/v3.11.4, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47210.json, https://github.com/patriksimek/vm2/security/advisories/GHSA-6j2x-vhqr-qr7q, https://nvd.nist.gov/vuln/detail/CVE-2026-47210, https://github.com/patriksimek/vm2/commit/6915fa4d9bcebd47b9a4f39a1adc1aa94ef6ffc6

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.01801%
EPSS Percentile
0.76582%
Introduced Version
0
Fix Available
27354d56563b0acb54eb9dd92edbc167612b9d4b

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