Unless you are blindly accepting parquet formatted files this really doesn't seem that bad.
A vulnerability in parsing images, xml, json, html, css would be way more detrimental.
I can't think of many services that accept parquet files directly. And of those usually you are calling it directly via a backend service.
https://github.com/apache/parquet-java/compare/apache-parque...
Grumbling about CVE inflation
I don't want to make too harsh remarks about the project, as it may simply not have been the right tool for my use case, though it sure gave me a lot of issues.
Not in the file format.