The company fears that its new product designs may have been leaked to a competitor.

leaked 是动词 leak 的过去分词形式。leak 本意是"液体或气体从容器中漏出"，引申为"信息或秘密被不正当泄露"。在句中用过去分词形式表示被动含义，指"设计可能被泄露"的状态。