On May 13, 2019, iOS 12.3 was released, including a patch to an exploit (sock_puppet) by Ned Williamson of Google Project Zero. On January 22, 2019, iOS 12.1.3 was released, including a patch to an exploit (voucher_swap), found independently by both Brandon Azad of Google Project Zero, and Zhuo Liang of Qihoo 360 Nirvan Team.