"Upadhyay has filed an application seeking security, saying there is threat to his life. We have opposed it," special public prosecutor Avinash Rasal said.
Rasal told the court today that there is no specific threat to Upadhyay. The court is likely to hear Upadhyay next week.
The Bombay High Court granted bail to Upadhyay on September 26 on the ground of parity, as some other accused, including Lt Colonel Prasad Purohit, have already got bail.
The Supreme Court last month granted bail to Purohit.
Seven people were killed in a bomb blast at Malegaon, a communally sensitive textile town in Nashik district of north Maharashtra, on September 29, 2008.