According to our current understanding of physics based on the theory of relativity, nothing can travel faster than light in a vacuum. The speed of light in a vacuum, denoted by 'c', is considered to be the ultimate speed limit of the universe.
If an object were hypothetically traveling faster than light in a medium, such as a medium with a refractive index greater than 1, and then released into space where the medium no longer exists, it would depend on the specific conditions and properties of the object.
In general, when an object moves from a medium to a vacuum, it experiences a change in the way it interacts with its surroundings. In the case of an object traveling faster than light in a medium, it is likely that the object's motion would be affected by the transition to a vacuum. How exactly it would be affected is uncertain and would require a theoretical framework that goes beyond our current understanding of physics.
It's worth noting that the concept of an object traveling faster than light raises many paradoxes and conflicts with our current understanding of causality and the laws of physics. It is not currently known whether it is even possible for an object to exceed the speed of light, and if it were possible, it would likely lead to violations of causality and other fundamental principles.