The vulnerability stems from improper input validation (CWE-20) in table partitioning handling. Though exact commit diffs aren't available, the advisory references commit 7ddcbc0 which patched this issue. Partitioning logic in phpMyAdmin is typically handled in Partition.php. The function PMA_handlePartitioning() would process partitioning parameters from user requests. Lack of validation on input size (e.g., number of partitions or parameter length) would allow crafted large requests to cause DoS via resource exhaustion, consistent with the described vulnerability.