The accuracy of a modern translation of the Bible should be judged by its meaning, in the light of the teachings of Tradition and Magisterium. If any translation contradicts definitive Church teaching, it cannot be correct.
The Vatican does not have a special collection of ancient manuscripts that guarantees the accuracy of modern translations. Most of the ancient manuscripts are not owned by the Vatican; they are in the hands of scholars and scholarly institutions.
There is no “original” Latin Vulgate. In the early Church, there were very many translations of Biblical books into Latin. Saint Jerome’s work in Latin is not extant.
Learning Hebrew, Greek, Aramaic, or Latin does not guarantee the accuracy of a translation; then you would be depending on your own understanding. What guarantees accuracy, concerning the path of salvation (rather than merely academic disputes), is the teaching of the Magisterium.
However, many modern Catholic Bible translations are not translated or edited in the light of magisterial teaching. This can be clearly seen from the character of the footnotes and annotations. Biblical scholarship, at the present time, is in a problematic state.