GHSA-c9wr-qm7p-p6vc

Duplicate Advisory: vm2: NodeVM custom resolution bypasses external path boundaries

Published

2026-09-27

Modified

2026-10-05

Sources

github-advisory

Summary

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-5h3f-q97h-ccvc. This link is maintained to preserve external references. ## Original Description vm2 before 3.12.2 contains an authorization bypass in the NodeVM external-module resolver. When an embedder configures `require.external` with a custom resolver (and `context: 'host'`), `LegacyResolver.customResolve` in lib/resolver-compat.js records the resolved module directory in `this.externals` as `new RegExp('^' + escapeRegExp(resolvedPath))`, without requiring a path separator or end-of-string boundary. Untrusted guest code can therefore require the allowlisted module (e.g. `foo`) and then require the absolute path of a non-allowlisted sibling whose path merely shares the resolved prefix (e.g. `.../node_modules/foo2/index.js`); the sibling passes `isPathAllowedForModule` and is loaded through `hostRequire`, so its top-level code runs in the host process before the exports are wrapped with `vm.readonly`, resulting in a sandbox escape and arbitrary code execution in the host context.

Affected packages

Remediation: Upgrade to 3.12.2 or later.

References

• https://github.com/advisories/GHSA-c9wr-qm7p-p6vc