Is it rude to ask for salt when a guest at a dinner?

Just had a book club dinner and the host served butternut squash soup. It was excellent but for my taste, could have used a bit of salt. I didn’t ask for any though, because it seems rude to ask. I would at a family member’s dinner probably but not as a dinner party guest.

What do you think? I’m open to opinions but I’m putting this in General because I don’t want to stray too far off topic.