Vulnerability in Patriksimek Vm2
CVE-2026-92944
vm2 versions 3.10.2 through 3.11.6 contain a sandbox escape vulnerability on Node.js 26 where Promise.prototype.finally() bypasses vm2's wrapper protections due to a stale PromiseThenLookupChain protector in V8 14.6. Attackers can exploit this by creating an async function that returns a Promise with an attacker-controlled constructor Symbol.species, allowing them to reach the host Function constructor and process object for arbitrary code execution.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (57.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/patriksimek/vm2/security/advisories/GHSA-27g9-p43v-cw3v (vendor-advisory)
- github.com/patriksimek/vm2/commit/7b26e81087ec88c287d9a4812f969d412f32774e (patch)
- github.com/patriksimek/vm2/commit/4635ddd85839461c8ad791990023a477efefe7bd (patch)
- www.vulncheck.com/advisories/vm2-3.10.2-through-3.11.6-sandbox-escape-via-promi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92944?
- CVE-2026-92944 is a critical-severity vulnerability in Patriksimek Vm2, classified under Protection Mechanism Failure. CVSS score: 9.8/10. Published 2026-09-17.
- How severe is CVE-2026-92944?
- Critical severity. CVSS v3 base score is 9.8 out of 10.