JLSEC-2026-774 `sniff_csv` provides filesystem access even when `enable_external_access` is disabled in duckdb

Summary Content in filesystem is accessible for reading using sniffcsv, even with enableexternalaccess=false. Details During a pentest, a security researcher was able to access environment variable data and other system data by using the sniffcsv function, even though we set enableexternalaccess ...