EUVD-2026-81598
GHSA-9f3g-34x8-92jc
Severity by source
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/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
Sandboxed attacker (PR:N in vm2 model) crosses the sandbox boundary to mutate host state (S:C, I:L); no confidentiality or availability impact; conditional technique so AC:H.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
vm2 versions from 3.9.6 before 3.11.7 fail to properly restrict access to accessor properties on frozen objects, allowing sandboxed scripts to bypass vm.freeze() and vm.readonly() protections. Attackers can use Object.getOwnPropertyDescriptor() or __lookupSetter__() to extract and invoke host object setters directly, mutating properties the embedder explicitly marked read-only.
AnalysisAI
Sandbox escape and read-only bypass in vm2 3.9.6 through 3.11.6 lets untrusted JavaScript running inside a NodeVM defeat the vm.freeze() and vm.readonly() protections and mutate host object properties that the embedder explicitly marked immutable. An attacker uses Object.getOwnPropertyDescriptor() or __lookupSetter__() to recover host-realm setters from accessor properties on frozen objects and invoke them directly, circumventing the Proxy-based restrictions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two conditions must both hold: (1) the host application runs attacker-controlled/untrusted JavaScript inside a vm2 NodeVM (the standard vm2 threat model), and (2) the embedder relies on vm.freeze() or vm.readonly() to protect host objects that are reachable from the sandbox - if no host objects are frozen/readonly, there is nothing to bypass and no impact. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuinely moderate, not critical, issue and the vendor CVSS 4.0 score of 6.3 (medium) reflects that honestly. … 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 - upgrade to 3.11.7 or later, as documented in the GitHub advisory GHSA-633r-hq9m-c4ff and the VulnCheck advisory (https://www.vulncheck.com/advisories/vm2-3.9.6-before-3.11.7-sandbox-bypass-via-accessor-descriptor). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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