Pen-testers have been hammering hard on SQLite for years. Attacks against SQLite are not as easy as you imagine.
Pen-testers do still occasionally find minor problems. See https://www.sqlite.org/src/info/04925dee41a21ffc for the latest example. But generally speaking, it is safe to open an SQLite database received from an untrusted source. If you are extra paranoid, activate the "PRAGMA cell_size_check=ON" feature and/or run "PRAGMA integrity_check" to verify the database before use.
Pen-testers do still occasionally find minor problems. See https://www.sqlite.org/src/info/04925dee41a21ffc for the latest example. But generally speaking, it is safe to open an SQLite database received from an untrusted source. If you are extra paranoid, activate the "PRAGMA cell_size_check=ON" feature and/or run "PRAGMA integrity_check" to verify the database before use.