The LZW decoding in the gdImageCreateFromGifPtr function in the Thomas Boutell graphics draw (GD) library (aka libgd) 2.0.33 allows remote attackers to cause a denial of service (CPU consumption) via malformed GIF data that causes an infinite loop.
https://issues.rpath.com/browse/RPL-939
https://exchange.xforce.ibmcloud.com/vulnerabilities/26976
http://www.vupen.com/english/advisories/2006/2174
http://www.trustix.org/errata/2006/0038
http://www.novell.com/linux/security/advisories/2006_31_php.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:122
http://www.mandriva.com/security/advisories?name=MDKSA-2006:113
http://www.mandriva.com/security/advisories?name=MDKSA-2006:112
http://www.debian.org/security/2006/dsa-1117
http://securityreason.com/securityalert/1067
http://secunia.com/advisories/23783
http://secunia.com/advisories/21186
http://secunia.com/advisories/21050
http://secunia.com/advisories/20887
http://secunia.com/advisories/20866
http://secunia.com/advisories/20853
http://secunia.com/advisories/20676