EUVD-2026-81587
GHSA-3f84-vwv5-r42g
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
PR:N and AV:N because untrusted sandbox code is the unauthenticated attacker; AC:H for the specific bridged-Promise plus host-object-property rejection precondition; S:C as the escape breaks out to the host process.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
vm2 3.11.6 is vulnerable to a sandbox escape leading to remote code execution in the host Node.js process. The fix for GHSA-m283-3h24-438v is incomplete: the bridge gate at lib/bridge.js:1624 identity-checks only the direct call target when deciding whether to rebuild/sanitise a rejected host Promise value. Registering the rejection handler through Function.prototype.call or .apply indirection (e.g., p.then.call(p, undefined, cb)) makes the intercepted target host Function.prototype.call, so the sanitiser never runs and the raw host error reaches sandbox code with its own properties intact. If an embedder exposes a host-realm Promise to the sandbox (an async host function bridged via the sandbox option, or a NodeVM external module's async method) and that Promise rejects with an Error carrying a non-primitive own property referencing a host object (for example err.detail = process), untrusted code in the sandbox obtains a fully functional proxy to that host object and can execute arbitrary commands with the privileges of the host process (e.g., e.detail.mainModule.require('child_process').execSync(...)). The direct p.then(undefined, cb), bind, and Reflect.apply forms are correctly sanitised. Fixed in vm2 3.11.7.
Articles & Coverage 1
AnalysisAI
Sandbox escape leading to remote code execution in vm2 3.11.6 lets untrusted code inside the sandbox reach a live proxy to a host-realm object and run commands with the host process privileges, for example through e.detail.mainModule.require('child_process').execSync(...). The flaw is an incomplete fix for GHSA-m283-3h24-438v: registering a rejection handler via Function.prototype.call or .apply indirection (p.then.call(p, undefined, cb)) bypasses the identity check at lib/bridge.js:1624, so the raw host Error and its non-primitive own properties are handed to sandbox code. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the vm2 threat model (host application intentionally executes untrusted JavaScript in a vm2 3.11.6 sandbox) PLUS a specific embedder configuration: the application must expose a host-realm Promise to the sandbox - either an async host function bridged through the sandbox option, or an async method on a NodeVM external module - and that Promise must reject with an Error object that carries a non-primitive OWN property referencing a host object (e.g., err.detail = process). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine, high-priority sandbox-escape-to-RCE, not a high-CVSS-but-low-real-risk inflation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: vm2 3.11.7 fixes the bypass, and upgrading is the only complete remediation; the advisory is at https://github.com/patriksimek/vm2/security/advisories/GHSA-647f-g98j-qq25 and the VulnCheck analysis at https://www.vulncheck.com/advisories/vm2-3.11.6-remote-code-execution-via-promise-call-apply. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all applications and services that embed vm2 3.11.6 or earlier and confirm whether they bridge async host Promises into sandboxed code; if the vendor-released patch 3.11.7 cannot be deployed immediately, temporarily disable that bridging pattern, block sandbox code from invoking rejection handlers through Function.prototype.call or .apply against host Error objects, and restrict host-process child_process/execSync capabilities. …
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