CVE-2026-100721

CVE-2026-100721 · vm2 before 3.12.2 Authorization Bypass via Custom Resolver

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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.

CVSS 9.5 · Kritisch · EPSS 0,4% · Öffentlicher Exploit · Korrektur verfügbar

Veröffentlicht

2026-09-27T01:28:28.596Z

Aktualisiert

2026-09-28T16:51:10.611Z

Technologie-Stack: node

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