ReDoS (Regular Expression Denial of Service)

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Introduction

What comes to your mind when you think of Denial-of-Service Attacks? Probably an army of bots trying to access the resources of a web server to the extent of crippling it. Well, this is surely a way of causing a Denial-of-Service attack. However, there is one more way which you might not have heard of. It’s called ReDoS and is caused due to Regular Expressions.