This story is included in:

Boba Fett: Enemy of the Empire

and

Comic Book published December 1997 as Boba Fett: 1/2 by Wizard:

Synopsis:
While en route to Coruscant, Slave 1 picks up a distress signal from a ZZ-class freighter, Mingula. All crew is dead. Boba takes a prisoner, Tsumo, with him onboard the freighter. There is another prisoner in the hold who named Chung. They find Volpau in a Death Casket, with a royal amulet in it, and the dead crew with boils all over them. Ubuugan fleshborers come out of there bodies and attack Fett and Tsumo. Tsumo is infected and dies from the fleshborers. Because of Fetts mandalorian armor, the fleshborers, don't make it though yet. The fleshborers have eaten through the airlock and have boarded Slave 1. Boba torches the fleshborers but the flames are heating the power cells. He then escapes though the waste chute. The Mingula explodes and Slave 1 intercepts Fett. Thinking that the fleshborers are still on the ship and that Chung is dead, Boba rushes to the prisoner hold. There, Chung is eating the dead fleshborers as a snack. Fett has lost Tsumo, but gained a royal amulet.

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