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CVE-2026-93603— vm2 before 3.12.1 Sandbox Escape RCE via Non-Strict Host Function

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 through 3.12.0 (fixed in 3.12.1) does not correctly handle a nullish receiver in the apply trap of its bridge (lib/bridge.js): when sandboxed code calls a host-provided non-strict (sloppy-mode) function without a receiver — e.g. , a detached method, , , ,

CVSS 10.0 · Critical

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-93603

Vulnerability Information
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Vulnerability Title
vm2 before 3.12.1 Sandbox Escape RCE via Non-Strict Host Function
Source: CVE Program / CVE List V5
Vulnerability Description
vm2 through 3.12.0 (fixed in 3.12.1) does not correctly handle a nullish `this` receiver in the apply trap of its bridge (lib/bridge.js): when sandboxed code calls a host-provided non-strict (sloppy-mode) function without a receiver — e.g. `fn()`, a detached method, `fn.call()`, `fn.apply(undefined)`, `Reflect.apply(fn, undefined, [])`, or `fn.bind()()` — the undefined receiver is passed straight through to the host call, and V8 substitutes the host realm's global object for `this`. vm2 then wraps and returns that object to the sandbox, giving sandboxed script a live proxy of the host global. This allows a complete sandbox escape: untrusted script can reach `process` and execute arbitrary code/commands on the host (for example via `process.getBuiltinModule('child_process').execSync`). Exploitation requires that the embedding application expose at least one non-strict host function to the sandbox; strict-mode and ES module host functions are not affected.
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
对生成代码的控制不恰当(代码注入)
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-2026-93603

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III. Intelligence Information for CVE-2026-93603

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Other References for CVE-2026-93603 (2)

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

CVE-2026-93605 10.0 CRITICAL vm2 NodeVM before 3.12.1 Remote Code Execution via child_process
CVE-2026-93606 10.0 CRITICAL vm2 before 3.12.1 Sandbox Escape via Promise Symbol.species
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-94

V. Comments for CVE-2026-93603

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