patriksimek vm2 up to 3.12.0 Bridge lib/bridge.js hostPromiseSanitizeReject privileges management

Summaryinfo

A vulnerability classified as critical was found in patriksimek vm2 up to 3.12.0. This vulnerability affects the function hostPromiseSanitizeReject of the file lib/bridge.js of the component Bridge. Such manipulation leads to privileges management. This vulnerability is listed as CVE-2026-93606. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in patriksimek vm2 up to 3.12.0 and classified as critical. Affected by this issue is the function hostPromiseSanitizeReject of the file lib/bridge.js of the component Bridge. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

vm2 (npm) versions 3.12.0 and earlier contain a sandbox escape in `VM` and `NodeVM`. When an embedder exposes a host API that returns a host-realm Promise, the bridge's rejection sanitizer (hostPromiseSanitizeReject / makeSanitizedPromiseCallback / normalizeHostPromiseCallbacks in lib/bridge.js) only wraps `then`/`catch` rejection slots that hold a function, and the sandbox-side `Symbol.species`/`.then` neutralization is installed only on the sandbox intrinsic `Promise.prototype`, so it never applies to a host Promise. Code running inside the sandbox can overwrite `p.constructor[Symbol.species]` on the host Promise and then call `p.then()` with no `onRejected` handler; V8 substitutes its internal Thrower, which re-throws the raw host rejection value into a resolve/reject closure captured by the attacker. This delivers an unsanitized, fully functional bridge proxy of the host object to sandboxed code, bypassing handleException and hostPromiseSanitizeReject. If the rejection value is host-pivotable (for example a host `process` object), this results in arbitrary code execution on the host. Fixed in 3.12.1.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-93606 since 09/18/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 3.12.1 eliminates this vulnerability.

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Productinfo

Vendor

• patriksimek

Name

• vm2

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12.0

Website

• Product: https://github.com/patriksimek/vm2/

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