Gardaí are investigating an aggravated burglary in Cobh, Co Cork.
Officers were alerted to an incident at an apartment on Lynch's Quay shortly before 2.00am on Sunday.
A man in his 40s was allegedly assaulted by another man and had multiple stab wounds following a fight.
The injured man was taken to Cork University Hospital with serious injuries.
Another man aged in his 20s was arrested a short time later and is being detained at Cobh Garda station.
He is due to appear in Cork City Court later.
Gardaí say investigations are ongoing.