exif.c in PHP before 4.3.11 allows remote attackers to cause a denial of service (memory consumption and crash) via an EXIF header with a large IFD nesting level, which causes significant stack recursion.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10307
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=154025
http://www.redhat.com/support/errata/RHSA-2005-406.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:072
http://www.gentoo.org/security/en/glsa/glsa-200504-15.xml
http://lists.apple.com/archives/security-announce/2005/Jun/msg00000.html
http://cvs.php.net/diff.php/php-src/ext/exif/exif.c?r1=1.118.2.29&r2=1.118.2.30&ty=u