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Sandbox Breakout in safe-eval

Description

Affected versions of `safe-eval` are vulnerable to a sandbox escape. By accessing object constructors, un-sanitized user input can access the entire standard library and effectively break out of the sandbox. ## Proof of Concept: This code accesses the process object and calls `.exit()` ``` var safeEval = require('safe-eval'); safeEval("this.constructor.constructor('return process')().exit()"); ``` ## Recommendation Update to version 0.4.0 or later


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