A new research paper highlights the security risks in pacemakers. In short, some pacemakers can be reprogrammed wirelessly, and their security isn’t good enough to prevent hackers. Someone would have to be standing quite close to the victim for this to happen, but it’s very concerning that it’s possible. The consequences, of course, are deadly.
The summary of the security research is here: http://blog.whitescope.io/2017/05/understanding-pacemaker-systems.html
What can you do? Talk to your doctors, make them aware of the problems. The manufacturers need to feel pressured into improving security.