The Pope uses the Nova Vulgata, also known as the New Vulgate. This is the official Latin Bible of the Roman Catholic Church. The current version was published in 1986 and is a revised version of the Vulgate, which was the standard Latin Bible for centuries.
While the Pope primarily uses the Nova Vulgata, he may also use other translations, especially when addressing a general audience. For example, he may use the Revised New American Bible (RNAB), which is a widely used English translation in the United States, or the New Revised Standard Version (NRSV), which is a popular English translation approved for use by the Catholic Church.
Catholics are encouraged to use Bible translations approved by the Church, as these translations ensure accuracy and faithfulness to the original text. The United States Conference of Catholic Bishops (USCCB) provides a list of approved translations for Catholics.