EUVD-2026-81585
GHSA-9fxx-mv6c-j5xp
Severity by source
CVSS:4.0/AV:N/AC:H/AT:P/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
Untrusted code is the attacker (PR:N) submitted remotely (AV:N); AC:H reflects the required non-default nesting+array-require configuration; sandbox-to-host escape is S:C with full C/I/A impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
vm2 is a sandbox for running untrusted Node.js code. In versions >= 3.11.4 and <= 3.11.6, the NodeVM constructor computes hasRealRequireConfig with typeof requireOpts = 'object' && requireOpts ! null, so an array-shaped require value (for example require: []) satisfies the guard that is meant to reject nesting without an explicit require configuration. makeResolverFromLegacyOptions() then destructures the array into undefined option fields and returns a resolver containing only NESTING_OVERRIDE.vm2. As a result, an attacker who can supply JavaScript executed by a NodeVM configured with truthy nesting and an array-shaped require (e.g. new NodeVM({nesting: true, require: []})) can require the host vm2 module, create an inner NodeVM with an attacker-chosen builtin allowlist (such as child_process), and execute arbitrary commands with the privileges of the host Node.js process, escaping the sandbox. Outer builtin restrictions do not constrain the attacker-created inner NodeVM. This issue is fixed in vm2 3.11.7.
Articles & Coverage 1
AnalysisAI
Sandbox escape and remote code execution in vm2 versions 3.11.4 through 3.11.6 allow JavaScript executed inside a NodeVM to break out and run arbitrary commands with the privileges of the host Node.js process. The flaw is reachable only in a specific, non-default configuration where the NodeVM is created with a truthy nesting value and an array-shaped require option (for example new NodeVM({nesting: true, require: []})); in that case the array satisfies a guard intended to reject nesting without an explicit require configuration, and the resulting resolver falls back to a nesting override that permits the sandboxed code to require the host vm2 module and construct an inner NodeVM with an attacker-chosen builtin allowlist such as child_process. …
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Vulnerability AssessmentAI
| Exploitation | Requires a vm2 NodeVM (version 3.11.4-3.11.6) instance created with BOTH `nesting` set to a truthy value AND an array-shaped `require` option (e.g. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 vector (9.5, AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H) rates this near-maximum, and the technical impact justifies it: a complete vm2 sandbox escape yielding arbitrary command execution (e.g. … 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: upgrade to vm2 3.11.7 or later, which is the version that fixes this issue; see advisory https://github.com/patriksimek/vm2/security/advisories/GHSA-8hr7-r645-pc6w and commit https://github.com/patriksimek/vm2/commit/54b54b74a382577f0bcd0538c5bf99acdcd7f53b. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all applications using vm2 versions 3.11.4 through 3.11.6, with particular attention to those using the NodeVM constructor with a truthy nesting option and an array-shaped require option (e.g., new NodeVM({nesting: true, require: []})). …
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