Via Texas Association of Realtors:
Q: I made an offer on a home, and an inspector found several things that need to be repaired that weren’t listed on the seller’s disclosure. The seller refuses to make the repairs. Doesn’t he have to?
A: No. A professional inspection will often reveal items in need of repair that the seller didn’t know about. When that happens, you can propose an amendment to the contract requesting that the seller make specific repairs. However, the seller is not obligated to accept the amendment to make repairs.
If he does not accept the amendment, and if your contract includes a termination option, you have the right to terminate the contract prior to the option period’s expiration date.