Who cursed dumbledore?

This curse would rapidly cause the death of anyone who came into contact with it, although in certain cases the spread of the curse could be slowed down by magical means. In the case of Dumbledore, this curse caused serious injury to his hand, causing it to look as if it had died, and would prove fatal in roughly one year. read more

Tom put a powerful curse on the ring, of which Dumbledore was either not aware of, underestimated, or chose to ignore: However, Dumbledore recognised the symbol of the Deathly Hallows on the ring's black stone and recognised it as the Resurrection Stone, something for which Dumbledore had searched for the greater part of his life. read more

Dumbledore suffered from the curse put on Marvolo's ring by Lord Voldemort. Though it is never explained what sort of curse it is, it is the equivalent of a slow acting poison. Like the potion in the enchanted lake, Lord Voldemort put a curse on the ring which was only to weaken the person who put it on. read more

The effects of the curse on Marvolo Gaunt's Ring is similar, if not identical, to the effects of severe necrosis (premature death of cells) and rhabdomyolysis (death of muscle tissue throughout the body) after a venomous snake bite, usually from the Bothrops asper. read more