What are some footguns? It does seem easy
Once strings are in play, it quickly gets very hairy though, with quoting and escaping that's all over the place.
Badly formed, damaged, or truncated files are another caution area— are you allowed to bail, or required to? Is it up to your parser to flag when something looks hinky so a human can check it out? Or to make a judgment call about how hinky is hinky enough that the whole process needs to abort?
And if you implement your own, you get to choose the answers you want.
Regardless of the format if you're parsing something and encounter an error there are very few circumstances where the correct action is to return mangled dat.
It's not usually realistic to force your data source into compliance, nor is manually fixing it in between typically a worthwhile pursuit either.