{"id":"CVE-2026-92957","title":"vm2 through 3.11.6 does not normalize `node:`-prefixed builtin specifiers when evaluating user-supplied negative (deny) entries in a NodeVM wildcard require policy","summary":"vm2 through 3.11.6 does not normalize `node:`-prefixed builtin specifiers when evaluating user-supplied negative (deny) entries in a NodeVM wildcard require policy. Although NodeVM strips the `node:` prefix during require() resolution, n…","severity":"critical","cvss":9.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-269"],"vendor":"patriksimek","product":"vm2","affected":["vm2 < 3.11.7"],"published":"2026-09-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T18:17:15.430","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92957","references":[{"url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-8686-vhfx-7r3j","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/vm2-before-3.11.7-authentication-bypass-via-node-prefix","label":"disclosure@vulncheck.com"},{"url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-8686-vhfx-7r3j","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-17T17:24:58.866510Z"},"ingestedAt":"2026-09-17T14:19:30.990Z","epss":0.00493,"epssPercentile":0.41451,"slug":"CVE-2026-92957","body":"## Overview\n\nvm2 through 3.11.6 does not normalize `node:`-prefixed builtin specifiers when evaluating user-supplied negative (deny) entries in a NodeVM wildcard require policy. Although NodeVM strips the `node:` prefix during require() resolution, negative wildcard entries are matched by exact string comparison against the canonical builtin names, so a policy such as `new NodeVM({ require: { builtin: ['*', '-node:child_process'] } })` fails to deny the canonical `child_process` module. Sandboxed code can therefore obtain the host `child_process` builtin via `require('child_process')` or `require('node:child_process')`, gaining references to process-spawning APIs such as execSync and spawn, which is equivalent to host command-execution capability for untrusted sandbox code. Fixed in vm2 3.11.7. (Suggested title: \"vm2 before 3.11.7: NodeVM builtin deny-list bypass via node:-prefixed specifiers exposes child_process\")\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":67,"depthScoreParts":{"impact":54.5,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":206497,"id":"CVE-2026-92957","ts":1789669562202,"field":"exploit_available","old":"false","new":"true"}]}