Due to an uncaught integer overflow, PDO::quote() of PDO_SQLite may return a not properly quoted string. it is possible to force the function to return a single apostrophe, if the function is called on user supplied input without any length restrictions in place (common memory_limit settings should prevent that though, and usually also post_max_size etc.). The issue is patched in versions 8.0.27, 8.1.14 and 8.2.1.