North says imprisoned US citizen Pae Jun-Ho's case will be heard at Supreme Court but fails to give details of charges.
On Saturday, amid soaring tensions between Pyongyang and the West, the KCNA said US citizen Pae Jun-Ho had admitted to the charges and would soon face "judgment".
He has been in prison in the North since November.
"In the process of investigation he admitted that he committed crimes aimed to topple the Democratic People's Republic of Korea with hostility toward it," the report said. "His crimes were proved by evidence".
Pae was arrested in November as he entered the northeastern port city of Rason, which lies inside a special economic zone near North Korea's border with Russia and China.