Peter Gilheney disappeared from HMP Standford Hill, in Eastchurch, on Monday. Kent Police said the 29-year-old, failed to return after a short release period.
Gilheney, is described as 5ft 2ins, with a stocky build. He is the fourth prisoner to escape from HMP Standford Hill this year.
More top news
Sunday evening's weather update for the east
Sunday evening's weather update for the west
The 22 year old man is seriously injured in hospital. Police believe a baseball bat and iron bar may have been used in the attack