EUVD-2026-82898
GHSA-2mqq-5j76-f3c6
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
Untrusted sandboxed script (PR:N, UI:N) escapes to host RCE crossing the sandbox trust boundary (S:C) with full C/I/A:H; the non-strict-host-function prerequisite is a common deployment condition, so AC:L.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Sandbox escape in vm2 through 3.12.0 lets unauthenticated remote attackers execute arbitrary code on the host when the embedding application exposes at least one non-strict (sloppy-mode) host function to the sandbox. By calling such a function with a nullish receiver (fn(), fn.call(), Reflect.apply(fn, undefined, []), etc.), sandboxed script causes V8 to substitute the host realm’s global object for this, which vm2 then wraps and returns as a live proxy of the host global; the attacker can then reach process and run commands such as process.getBuiltinModule('child_process').execSync. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the embedding application expose at least one non-strict (sloppy-mode) host-provided function to the vm2 sandbox; the attacker then calls it with a nullish/undefined receiver so V8 leaks the host realm's global object. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine top-tier priority, not a high-CVSS-but-low-risk artifact. … 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 3.12.1, which fixes the nullish-receiver mishandling in the bridge’s apply trap; see the advisory at https://github.com/patriksimek/vm2/security/advisories/GHSA-j89j-5m6r-cr2q. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all applications and services that embed vm2 at version 3.12.0 or earlier, confirm exposure, and prioritize internet-facing or multi-tenant sandbox use cases; where immediate upgrade is not possible, isolate affected services and restrict outbound network access. …
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External POC / Exploit Code
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