The Portable Network Graphics library (libpng) 1.0.15 and earlier allows attackers to cause a denial of service (crash) via a malformed PNG image file that triggers an error that causes an out-of-bounds read when creating the error message.
http://www.mandriva.com/security/advisories?name=MDKSA-2006:213
http://www.mandriva.com/security/advisories?name=MDKSA-2006:212
http://www.mandriva.com/security/advisories?name=MDKSA-2004:040
http://marc.info/?l=fedora-announce-list&m=108451353608968&w=2
http://marc.info/?l=fedora-announce-list&m=108451350029261&w=2