What are chances of survival if you have septicemia after heart bypass and your on dialysis?

Limited. You have infection that is serious following bypass surgery as well as dialysis. All are treatable but having several systems not work is potentially dangerous, especially if you have shock from the sepsis and it is impairing heart and kidney function.
A challenge. That is a lot to contend with but don't lose hope. Many people overcome huge obstacles with a good team helping.