Vulnerability in Patriksimek Vm2
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 · last modified .
CVSS v3 metric
CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/patriksimek/vm2/security/advisories/GHSA-633r-hq9m-c4ff (vendor-advisory)
- www.vulncheck.com/advisories/vm2-3.9.6-before-3.11.7-sandbox-bypass-via-accesso… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92949?
- CVE-2026-92949 is a medium-severity vulnerability in Patriksimek Vm2, classified under Modification of Assumed-Immutable Data (MAID). CVSS score: 4.0/10. Published 2026-09-17.
- How severe is CVE-2026-92949?
- Medium severity. CVSS v3 base score is 4.0 out of 10.