PHP is using /etc/httpd/conf/magic file which is too simple (PNG definition is missing for example). This may be better to use /usr/share/file/magic.mime (for function from http://cz2.php.net/manual/en/ref.mime-magic.php) like new finfo functions are using by default (see http://cz2.php.net/manual/en/function.finfo-open.php).
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2008-0327.html