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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
The PDOSessionHandler class allows to store sessions on a PDO connection. Under some configurations (see below) and with a well-crafted payload, it was possible to do a denial of service on a Symfony application without too much resources.

An application is vulnerable when:

- It is using PDOSessionHandler to store its sessions;

- And it uses MySQL as a backend for sessions managed by PDOSessionHandler;

- And the SQL mode does not contain STRICT_ALL_TABLES or STRICT_TRANS_TABLES (check via SELECT @@sql_mode).

POC:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/44768.tgz