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CVE-2026-93606— vm2 before 3.12.1 Sandbox Escape via Promise Symbol.species

Quick assessment

Affected
patriksimek vm2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

vm2 (npm) versions 3.12.0 and earlier contain a sandbox escape in and . When an embedder exposes a host API that returns a host-realm Promise, the bridge's rejection sanitizer (hostPromiseSanitizeReject / makeSanitizedPromiseCallback / normalizeHostPromiseCall

CVSS 10.0 · Critical
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I. Basic Information for CVE-2026-93606

Vulnerability Information
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Vulnerability Title
vm2 before 3.12.1 Sandbox Escape via Promise Symbol.species
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
保护机制失效
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
patriksimek vm2 0 ~ 3.12.1 -

II. Public POCs for CVE-2026-93606

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III. Intelligence Information for CVE-2026-93606

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Other References for CVE-2026-93606 (2)

Same Patch Batch · patriksimek · 2026-09-18 · 4 CVEs total

CVE-2026-93603 10.0 CRITICAL vm2 before 3.12.1 Sandbox Escape RCE via Non-Strict Host Function
CVE-2026-93605 10.0 CRITICAL vm2 NodeVM before 3.12.1 Remote Code Execution via child_process
CVE-2026-93604 7.2 HIGH vm2 3.11.8 Sandbox Escape via crypto.setFips

IV. Related Vulnerabilities

Same product: vm2
Same vendor: patriksimek
Same weakness: CWE-693

V. Comments for CVE-2026-93606

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