mysql2: Improper Input Validation

Versions of the package mysql2 before 3.9.3 are vulnerable to Improper Input Validation through the keyFromFields function, resulting in cache poisoning. An attacker can inject a colon (:) character within a value of the attacker-crafted key.

Keys of objects in mysql node module v2.0.0-alpha7 and earlier are not escaped with `mysql.escape()` which could lead to SQL Injection.