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Fri, 18 Sep 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | vm2 (npm) versions 3.12.0 and earlier contain a sandbox escape in `VM` and `NodeVM`. When an embedder exposes a host API that returns a host-realm Promise, the bridge's rejection sanitizer (hostPromiseSanitizeReject / makeSanitizedPromiseCallback / normalizeHostPromiseCallbacks in lib/bridge.js) only wraps `then`/`catch` rejection slots that hold a function, and the sandbox-side `Symbol.species`/`.then` neutralization is installed only on the sandbox intrinsic `Promise.prototype`, so it never applies to a host Promise. Code running inside the sandbox can overwrite `p.constructor[Symbol.species]` on the host Promise and then call `p.then()` with no `onRejected` handler; V8 substitutes its internal Thrower, which re-throws the raw host rejection value into a resolve/reject closure captured by the attacker. This delivers an unsanitized, fully functional bridge proxy of the host object to sandboxed code, bypassing handleException and hostPromiseSanitizeReject. If the rejection value is host-pivotable (for example a host `process` object), this results in arbitrary code execution on the host. Fixed in 3.12.1. | |
| Title | vm2 before 3.12.1 Sandbox Escape via Promise Symbol.species | |
| First Time appeared |
Vm2 Project
Vm2 Project vm2 |
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| Weaknesses | CWE-693 | |
| CPEs | cpe:2.3:a:vm2_project:vm2:*:*:*:*:*:node.js:*:* | |
| Vendors & Products |
Vm2 Project
Vm2 Project vm2 |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-09-18T17:48:56.766Z
Reserved: 2026-09-18T11:01:45.930Z
Link: CVE-2026-93606
No data.
Status : Deferred
Published: 2026-09-18T14:19:12.500
Modified: 2026-09-18T18:18:31.267
Link: CVE-2026-93606
No data.
OpenCVE Enrichment
No data.
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CWE-693
Protection Mechanism Failure