void WavpackSeekTrailingWrapper (WavpackContext *wpc)
{
    if ((wpc->open_flags & OPEN_WRAPPER) &&
        wpc->reader->can_seek (wpc->wv_in) && !wpc->stream3)
            seek_eof_information (wpc, NULL, TRUE);
}

The product reads data past the end, or before the beginning, of the intended buffer.