{"id":"CVE-2026-92957","published":"2026-09-17T14:18:01.813","lastModified":"2026-09-17T18:17:15.430","description":"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, 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\")","cvssScore":9.9,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwes":["CWE-269"],"vendors":[],"products":[],"references":[{"url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-8686-vhfx-7r3j","tags":[]},{"url":"https://www.vulncheck.com/advisories/vm2-before-3.11.7-authentication-bypass-via-node-prefix","tags":[]},{"url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-8686-vhfx-7r3j","tags":[]}],"exploitRefs":[{"url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-8686-vhfx-7r3j","tags":[]},{"url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-8686-vhfx-7r3j","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows sandboxed code to bypass the built-in deny-list by using `node:`-prefixed specifiers, gaining access to potentially dangerous APIs like `child_process`, which can lead to command execution.","exploitability":"Exploitation is relatively straightforward once the precondition of having control over the policy configuration is met.","blast_radius":"If exploited, this could result in unauthorized command execution within the sandbox, potentially leading to full host compromise.","remediation":"Upgrade to vm2 3.11.7 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","vm2","nodejs","sandbox","bypass"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-27T08:58:11.782Z"}}