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Zipbomb JSON.
Someone who is not me should formulate a maximally-malicious JSON file. I made one with a nesting depth of ~182 million, but "jq" gives up early, at only around depth 3,000. So one trick would be to find the right balance of nesting and array length that stays under typical parsers' limits as long as possible, while requiring as much RAM as possible to get there.
https://jwz.org/b/yk2x