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CVE-2026-47686

CriticalPublished

vm2: Missing Error.cause Sanitization Enables VM2 Sandbox Escape to RCE

Published: Aug 17, 2026
Updated: Aug 19, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 29, 2026

Primary CVSS

9.9/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 31.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.6, handleException() in lib/setup-sandbox.js sanitizes SuppressedError.error, SuppressedError.suppressed, and AggregateError.errors but does not sanitize Error.cause, allowing sandbox code to obtain a powerful host object such as process from an embedder-exposed host function that throws an error with that object as its cause and then execute arbitrary host commands. This issue is fixed in version 3.11.6.

Sources

1day-archiveResearch
Technical deep-dives and root cause analyses of recently disclosed CVEs - reverse engineering patches, building proof-of-concepts, and documenting exploitation techniques in the 1-day window.

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