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alfactf

Task: Web shop with JavaScript/Node.js backend where user controls divisor in price calculation. Solution: Exploit division by zero (1/0 and 1/-0) to create Infinity values, then combine them to get NaN balance which bypasses all comparison checks.

$ ls tags/ techniques/
shopnodejsjavascriptnaninfinitytype_coerciondivision_by_zeroinput_validation
NaN balance manipulationDivision by zero exploitationJavaScript comparison quirks
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