Would've filed an issue, but the request is to post here first. (?)
Using version 9.1 BaseX app, a GZIP archive https://nvd.nist.gov/feeds/json/cve/1.0/nvdcve-1.0-recent.json.gz of a JSON database can't be used to properly create a database. Interestingly, a ZIP archive https://nvd.nist.gov/feeds/json/cve/1.0/nvdcve-1.0-recent.json.zip works fine.
There is no error message, just an empty database is created silently.
IDK if the GZIP problem is more widespread.