A vulnerability in the Oracle MySQL Server optimizer component affects versions 8.0.39 and prior, 8.4.2 and prior, and 9.0.1 and prior. This flaw allows a low-privileged attacker with network access to cause a denial of service (DoS) by hanging or crashing the MySQL Server. The vulnerability has a CVSS 3.1 base score of 6.5, indicating a medium severity impact focused on availability.