Execution of a decree is meant to give a successful plaintiff the fruits of the judgment without unnecessary delay, but that process can be disrupted when someone who was never a party to the original suit steps forward and claims that the attached property is actually theirs, not the judgment-debtor's. The Code has to provide a quick, workable way to resolve that dispute without letting it become a fresh, drawn-out litigation of its own.
Order XXI Rule 58 of the CPC is built for exactly this situation. It directs that whenever a claim or an objection is raised against the attachment of property during execution, the court that is executing the decree, not the court that originally passed it, and not some future court after execution has run its course, must adjudicate that claim itself, deciding questions of right, title, and interest in the property as part of the execution proceedings.
Earlier versions of this kind of procedure did sometimes push claimants toward filing a separate suit to establish title, but that approach was recognised as slow and disruptive to the execution process, which is why the current rule keeps the question inside the execution proceedings and assigns it to the executing court directly. Waiting until execution is already complete would be too late to meaningfully protect a genuine third-party owner, since the property might already be sold by then, and referring the matter back to the court that passed the decree would add an unnecessary detour when the executing court is already seized of the attachment.
So under Order XXI Rule 58, a third party's claim of independent title to attached property shall be adjudicated by the executing court itself.