Your lease is a contract and is valid through its expiration date.
Of course, your lease may have an escape clause - read your lease to see what it says. And, you can speak to your landlord and see if you can come to terms on an early lease cancellation.
Typically, if you break your lease, you are responsible for the payments to the landlord through the end of the lease. However, I believe that most courts will dictate that the landlord must try to re-rent the unit to mitigate their losses, which will mitigate your losses. Your landlord may be able to sue you for lost rent in addition to your security department. Please note I am not an attorney and this is not intended to be legal advice. For lease/contract issues, you must speak with an attorney for legal advice.
However, keep in mind that you only have 8 months left on your lease. Have you even begun your home search yet? Have you met with a mortgage broker to determine how much home you can afford? It may take you a month or two to find your new home, than another month or two to close on the home. You then may want some overlap where you have both places - during this time you can paint and do any renovations on your new home prior to your moving in. Many buyers prefer to have some overlap, which makes their lives a lot easier.
You may not even have a need to break your lease. If you don't want to have too much overlap and your landlord will not let you out of the lease, then time your home search accordingly.
Sometimes asking nicely may do the trick. If they choose not to release you, read your lease to find the penalty that they may impose.
If you need assistance purchasing a home, please give me a call. Ron Goralski 860-989-7463 cell