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purchase price?
Down payment amount?
Can you qualify using your income and liabilities?
Until the ex-shapes up, it seems your Hubby's credit will be hindering your ability to purchase jointly. Is there any legal recourse from a prior Separation Agreement or Divorce Decree? I'm not an attorney, but our nation of laws requires us to follow them or pay consequences and while this naturally takes some time to enforce, it's certainly going to take time for your Hubby's credit to recover where he can qualify using his credit and income.
Meanwhile, this doesn't prevent Hubby from providing gift funds to you for down payment or to pay down your liabilities in the event you need to maximize your buying power in order to achieve your current goal.
Good Luck, go make it happen!