CVE-2026-47135 vm2: Sandbox escape via unblocked cross-realm Symbol.for keys + missing bridge write-trap symbol checks

vm2 is an open source vm/sandbox for Node.js. Prior to version 3.11.4, Symbol.for override in setup-sandbox.js only intercepts 2 of 9 dangerous Node.js cross-realm symbols. Combined with the bridge's set/defineProperty/deleteProperty traps having no isDangerousCrossRealmSymbol key check, sandbox...

CVE-2026-47135

CVE-2026-47135 vm2 sandbox escape : The vm2 sandbox (Node.js) before 3.11.4 exposes real cross-realm Node.js symbols due to an incomplete Symbol.for override (only blocks two of nine dangerous symbols) and missing isDangerousCrossRealmSymbol checks in bridge write traps (set/defineProperty/delete...

Incomplete List of Disallowed Inputs

Overview org.webjars.npm:vm2 is a sandbox that can run untrusted code with whitelisted Node's built-in modules. Affected versions of this package are vulnerable to Incomplete List of Disallowed Inputs through Symbol.for handling in lib/setup-sandbox.js and the bridge write traps in lib/bridge.js...

Arbitrary Code Injection

Overview org.webjars.npm:vm2 is a sandbox that can run untrusted code with whitelisted Node's built-in modules. Affected versions of this package are vulnerable to Arbitrary Code Injection through the BaseHandler write traps in lib/bridge.js. An attacker can mutate host Object.prototype,...