Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
vm2 before 3.12.2 has a NodeVM flaw in custom module resolution, where an allowlisted module's path also authorizes any file whose path merely shares its string prefix. Untrusted code running in a NodeVM configured with a custom resolver and host context can load such a file, which runs on the host. Upgrade to vm2 3.12.2 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 9.5 | Critical | 4.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H | CNA (VulnCheck) |
- CISA KEV Not listed.
- EPSS 0.0059, the 48th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 13:34 UTC First seen by agentprime
- 31 Oct 2026, 13:34 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-5h3f-q97h-ccvc
- OSV: GHSA-5h3f-q97h-ccvc
- github.com/patriksimek/vm2/security/advisories/GHSA-5h3f-q97h-ccvc
- nvd.nist.gov/vuln/detail/CVE-2026-100721
- github.com/patriksimek/vm2/commit/6ac3916da84e060c403e407b6b6318fcc66b0e72
- github.com/patriksimek/vm2/commit/91034466bfb7f56b95fd48083ec6ca36d058f164
- github.com/patriksimek/vm2/commit/ab4ee7d803e8c80155e9eb3672226bddbca4aa9c
- github.com/patriksimek/vm2/commit/fb4977f6211da6cadffdf1f3a2017a826a21c51f
- github.com/patriksimek/vm2
- github.com/patriksimek/vm2/releases/tag/v3.12.2
- www.vulncheck.com/advisories/vm2-before-3.12.2-authorization-bypass-via-custom-resolver