The penalty for the late filing of coram nobis can vary depending on the jurisdiction and the specific circumstances of the case. In general, most courts have specific deadlines for filing coram nobis petitions, and if the filing is submitted after that deadline, it may be rejected or dismissed. In some cases, the court may consider granting an extension of the deadline if the petitioner can provide a valid reason for the delay. However, there is no specific monetary or criminal penalty associated with the late filing of coram nobis.