What are some common signs of bad yellow squash and how can you tell if it is no longer safe to eat?

Common signs of bad yellow squash include mold, soft spots, discoloration, and a foul odor. To determine if yellow squash is no longer safe to eat, check for any of these signs and discard if present. Additionally, if the squash feels slimy or has a mushy texture, it is best to avoid consuming it.