Vulnerability Description
vm2 through 3.11.6 contains a builtin-module denylist bypass in NodeVM. When the embedder uses the builtin wildcard together with negative entries (e.g. require: { builtin: ['*', '-fs', '-child_process'] }), negative entries are matched by exact module name in lib/builtin.js, so -fs removes only the builtin named fs and does not remove builtin subpaths such as fs/promises. Sandboxed code can therefore call require('fs/promises') or require('node:fs/promises') and reach the promise-based filesystem API despite fs being denied; node: prefix handling is likewise inconsistent (a -node:fs/promises entry does not block require('fs/promises')). Host file creation and writing were confirmed via fsp.writeFile(), and other fs/promises operations (cp, mkdir, rename, rm, rmdir, truncate, read operations, etc.) are also reachable. This issue is fixed in vm2 3.11.7.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/patriksimek/vm2/security/advisories/GHSA-6rh5-qq4q-97xh
- https://www.vulncheck.com/advisories/vm2-before-3.11.7-denylist-bypass-via-fs-pr
- https://github.com/patriksimek/vm2/security/advisories/GHSA-6rh5-qq4q-97xh
FAQ
What is CVE-2026-92958?
CVE-2026-92958 is a vulnerability with a CVSS score of 8.5 (HIGH). vm2 through 3.11.6 contains a builtin-module denylist bypass in NodeVM. When the embedder uses the builtin wildcard together with negative entries (e.g. require: { builtin: ['*', '-fs', '-child_proces...
How severe is CVE-2026-92958?
CVE-2026-92958 has been rated HIGH with a CVSS base score of 8.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-92958?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.