Cal. Civ. Proc. Code § 489.420

If a defendant appeals and the enforcement of the judgment against the defendant is stayed by the filing of a sufficient undertaking on appeal as provided by this code, all property of the defendant which has been attached in the action shall be released from the attachment upon the failure of the respondent to object to the undertaking within the time prescribed by statute or, if an objection is made, upon a determination that the undertaking is sufficient.