When trying to open attachment mail over 1 MB I get blank page and I get under the error logs

[11-Jan-2007 11:15:11] PHP Warning:  fopen(temp//3050b0c001a63e56335d837a78ddb3ae): failed to open stream: Permission denied in /var/www/html/roundcube/program/steps/mail/func.inc on line 1357

[11-Jan-2007 11:15:11 +0200] PHP Error: Failed to write to temp dir in /var/www/html/roundcube/program/steps/mail/func.inc on line 1364

[11-Jan-2007 11:15:11] PHP Fatal error:  Allowed memory size of 20971520 bytes exhausted (tried to allocate 3316113 bytes) in /var/www/html/roundcube/program/lib/Mail/mimeDecode.php on line 321

/etc/php.ini

memory_limit = 32M

This can be a duplicate of an existing bug but I couldn't find anything already opened for these issues

Thanks for your help