As said by Irishguy28, there is no need to panic and 3hrs time for connection is more than enough to make it even with a delay of the incoming flight. In case you misconnect, you’ll likely be rebooked to DBV via ZAG (CDG-ZAG on AF or OU metal and ZAG-DBV on OU metal), as DBV is not a well-served destination by legacy airlines.