CVE-2026-92957

Vulnerability 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")

CVSS Score

Related Weaknesses (CWE)

References

• https://github.com/patriksimek/vm2/security/advisories/GHSA-8686-vhfx-7r3j
• https://www.vulncheck.com/advisories/vm2-before-3.11.7-authentication-bypass-via
• https://github.com/patriksimek/vm2/security/advisories/GHSA-8686-vhfx-7r3j