Vulnerability in Patriksimek Vm2
CVE-2026-92953
vm2 versions from 3.11.0 before 3.11.8 fail to protect host TypedArray and ArrayBuffer prototypes from sandbox mutation. Attackers can use prototype-walking primitives to reach and modify host Uint8Array.prototype, %TypedArray%.prototype, and ArrayBuffer.prototype, causing host-created typed arrays to observe attacker-controlled properties after VM.run() returns.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/patriksimek/vm2/security/advisories/GHSA-3vgf-8m4q-q4qr (vendor-advisory)
- www.vulncheck.com/advisories/vm2-3.11.0-through-3.11.7-prototype-pollution-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92953?
- CVE-2026-92953 is a critical-severity vulnerability in Patriksimek Vm2, classified under Improper Control of Dynamically-Managed Code Resources. CVSS score: 10.0/10. Published 2026-09-17.
- How severe is CVE-2026-92953?
- Critical severity. CVSS v3 base score is 10.0 out of 10.