If you have no other way of getting bud and you are trying to get high just turn that into a concentrate. I wouldn’t smoke bud rot weed. However we’ve all probably smoked some bud with a little rot. With all that being said:
you can pick out the “good parts” and then get iso alcohol 91% or higher. Just don’t use the 70% stuff. Stuff everything in the freezer, the buds and the iso, for at least a couple days. When you are ready quickly tear up the buds and throw in a mason jar. Pour over cold iso and shake for 20-30 seconds. Pour the mason jar through a strainer to grab the plant material. Then strain the iso/extract through coffee filters. Pour stained extract into a glass dish that allows it to set about 1/4 inch above the bottom. Then leave with a fan to evaporate. You can also just set on top of stove and use the exhaust vent. Wait 24-48 hours for all iso to evaporate. Then scrape up the concentrate. From that point you can decarb it if you want or hit in on a nail. I just prefer to decarb and then make edibles.
not an ideal situation, but at least you can turn your lemons into lemonade.