{"id":"CVE-2026-92954","title":"vm2 is a sandbox library for running untrusted JavaScript in Node.js","summary":"vm2 is a sandbox library for running untrusted JavaScript in Node.js. In versions >= 3.10.0 and <= 3.11.7, Promises returned from the host realm into the sandbox are not marked as handled at the bridge boundary; only Promises created ins…","severity":"high","cvss":8.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","cwe":["CWE-248"],"vendor":"patriksimek","product":"vm2","affected":["vm2 >= 3.10.0 < 3.11.8"],"published":"2026-09-17","updated":"2026-09-21","sourceUpdated":"2026-09-21T18:17:15.997","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92954","references":[{"url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-gjq8-xm47-88rc","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/vm2-3.10.0-through-3.11.5-denial-of-service-via-host-promise","label":"disclosure@vulncheck.com"},{"url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-gjq8-xm47-88rc","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00343,"epssPercentile":0.27863,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-21T17:15:31.102120Z"},"ingestedAt":"2026-09-17T14:19:30.989Z","slug":"CVE-2026-92954","body":"## Overview\n\nvm2 is a sandbox library for running untrusted JavaScript in Node.js. In versions >= 3.10.0 and <= 3.11.7, Promises returned from the host realm into the sandbox are not marked as handled at the bridge boundary; only Promises created inside the sandbox are wrapped with a rejection-swallowing handler (lib/setup-sandbox.js), and the bridge only installs host-side rejection sanitizers when sandbox code calls .then/.catch/.finally. As a result, code running in the sandbox can invoke a host function that returns a rejected Promise (for example events.once() exposed via the NodeVM events builtin, or any embedder-provided Promise-returning API) and simply ignore the return value, leaving the host Promise unhandled so that Node.js's default unhandled-rejection behavior terminates the host process. This is an incomplete fix of GHSA-hw58-p9xv-2mjh. The issue is fixed in version 3.11.8.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":59,"depthScoreParts":{"impact":47.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":208642,"id":"CVE-2026-92954","ts":1790013049908,"field":"exploit_available","old":"false","new":"true"}]}