CVE-2026-92949
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.
- Published Sep 17, 2026
- CVSS 6.3 medium
- 0.3% chance of exploitation in the next 30 days (EPSS)
- A fix is available