CVE-2026-93603 (GCVE-0-2026-93603)

Vulnerability from cvelistv5 – Published: 2026-09-18 13:20 – Updated: 2026-09-22 14:25
VLAI
Title
vm2 before 3.12.1 Sandbox Escape RCE via Non-Strict Host Function
Summary
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.
Severity
10 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
10 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 14:25 UTC
CWE
  • CWE-94 - Improper Control of Generation of Code ('Code Injection')
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7010 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
patriksimek vm2 Affected: 0 , < 3.12.1 (semver)
Unaffected: 3.12.1 (semver)
    cpe:2.3:a:vm2_project:vm2:*:*:*:*:*:node.js:*:*
Create a notification for this product.
Date Public
2026-09-03 00:00
Credits
RajChowdhury240
Show details on NVD website
To clipboard 

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