I don't think we have yet reached the stage of Islamic State attacks on boats in the Med. However a prudent boater would keep a close eye on goings on in the area and act with increased awareness and caution.
Yes IS has said their next stop is Europe
. Even stating they will attack Italy and specifically the Vatican. At present they lack the maritime capability to traverse from their land strongholds on the North African region. But let us remember that Somalia
pirates first started out with fast skiffs and then captured larger vessels which they then used as mother ships for their piracy
. So things can change and change quickly.
I would still travel the Med. Not the Red Sea however.
Keeping a close eye on things is sensible. What is certain is the European enforcement services are most definitely on high alert in the Med with every boat movement being tracked. I would expect more precautionary boardings by authorities in these waters.
Lastly. As any good girl or boy sea scout would say, Be Prepared.