The PNG reference library (aka libpng) before 1.0.43, and 1.2.x before 1.2.35, as used in pngcrush and other applications, allows context-dependent attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted PNG file that triggers a free of an uninitialized pointer in (1) the png_read_png function, (2) pCAL chunk handling, or (3) setup of 16-bit gamma tables.
https://www.redhat.com/archives/fedora-package-announce/2009-March/msg00771.html
https://www.redhat.com/archives/fedora-package-announce/2009-March/msg00769.html
https://www.redhat.com/archives/fedora-package-announce/2009-March/msg00412.html
https://www.redhat.com/archives/fedora-package-announce/2009-March/msg00272.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/48819
http://www.vmware.com/security/advisories/VMSA-2009-0007.html
http://www.us-cert.gov/cas/techalerts/TA09-218A.html
http://www.us-cert.gov/cas/techalerts/TA09-133A.html
http://www.debian.org/security/2009/dsa-1830
http://www.debian.org/security/2009/dsa-1750
http://support.apple.com/kb/HT3757
http://support.apple.com/kb/HT3639
http://support.apple.com/kb/HT3613
http://support.apple.com/kb/HT3549
http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.433952
http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.405420
http://security.gentoo.org/glsa/glsa-201209-25.xml
http://security.gentoo.org/glsa/glsa-200903-28.xml
http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html
http://lists.apple.com/archives/security-announce/2009/May/msg00002.html
http://lists.apple.com/archives/security-announce/2009/Jun/msg00005.html
http://lists.apple.com/archives/security-announce/2009/Aug/msg00001.html
http://downloads.sourceforge.net/libpng/libpng-1.2.34-ADVISORY.txt