vm2: Mutable Proxies for Host Intrinsic Prototypes Allows Sandbox Escape

Summary vm2's bridge exposes mutable proxies for real host-realm intrinsic prototypes and then forwards sandbox writes into the underlying host objects with otherReflectSet and otherReflectDefineProperty, which lets attacker-controlled JavaScript running in a default VM or inherited NodeVM mutate...

PT-2026-38396

Name of the Vulnerable Software and Affected Versions vm2 versions 3.9.6 through 3.10.5 Description The bridge in vm2 exposes mutable proxies for host-realm intrinsic prototypes and forwards sandbox writes into underlying host objects using otherReflectSet and otherReflectDefineProperty. This...