"Java Regex: Where 33 Characters Can Crash Your Server 8 Billion Times"

Java developers are vulnerable to Regular Expression Denial of Service (ReDoS) attacks, which can cause servers to crash due to exponential time complexity in regex pattern matching. This occurs when using Java's built-in regex engine with backtracking, allowing attackers to craft malicious inputs. A solution is to use the RE2J engine, which guarantees linear time matching, as seen in the "Rules" validation library. By switching to RE2J, developers can prevent ReDoS attacks and ensure secure input validation, protecting against potential server crashes and data breaches.