What do you mean by hacking? Can they hack and for example change my affiliate links?
No, I don’t believe so – the owner of an RSS feed CAN insert malicous scripts that will execute on the end users computer.. The scripts are usually executed to install viruses and malware. BUT if you only use feeds from trusted sources then this should not be a problem.
Your affiliate links cannot be replaced unless a users computer is infected (e.g. – browser first redirected through a proxy server where your affiliate links could then be replaced before the html is sent to the user). If you’re worried about it then use a click counter as it will hide affiliate links (also keeps ad blockers from blocking your links)
If you want to learn more about hacking RSS than search google for “feed injection”
as always, just my two cents