Sandbox escape in SandboxJS via Map.prototype.has overwrite
In SandboxJS (the @nyariv/sandboxjs JavaScript sandboxing library) prior to version 0.8.29, the built-in Map object is included in the library’s SAFE_PROTOTYPES set, and its prototype can be obtained from within the sandbox via Map.prototype. An attacker can then overwrite Map.prototype.has, which is used by the sandbox’s internal logic, allowing manipulation of security checks and resulting in a sandbox escape. The issue is fixed in SandboxJS 0.8.29.
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