Fetching details from the dictionary...
being caught in one's own trap; being hoisted by one's own petard
自分の発言が自縄自縛となった。
His own words became his own trap.
規則を厳しくした結果、自縄自縛に陥った。
As a result of tightening the rules, they fell into their own trap.
自縄自縛を避けるため慎重に行動すべきだ。
One should act carefully to avoid being caught in one's own trap.