It is an inflexion of infringing. It means damage, harm, hurt, hurt, affect, injure, infringe, violate, transgress.
1st and 3rd person singular present subjunctive of the verb to violate what damage or harm something or someone or to break the law or rules. Unless you want to ask about vulnere, in which case it is a latin word: the singular ablative of vulnus vulneris, wound, affliction.