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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.
    (CVE-2026-100721)

ID	Name	Product	Family	Type	Severity
473565	Echo: vm2: security update to 3.12.2	Tenable Cloud Security	Echo Local Security Checks	Local	critical
473565	Echo: vm2: security update to 3.12.2	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	critical
473028	SCA: security update for vm2 (GHSA-5h3f-q97h-ccvc)	Tenable Cloud Security	SCA Checks	Local	critical
473028	SCA: security update for vm2 (GHSA-5h3f-q97h-ccvc)	Tenable Self-Hosted Container Security	SCA Checks	Local	critical

Detections

Analytics

CVE-2026-100721

critical

Tenable Plugins

critical

critical

critical

critical