Multiple integer overflows in glpng.c in glpng 1.45 allow context-dependent attackers to execute arbitrary code via a crafted PNG image, related to (1) the pngLoadRawF function and (2) the pngLoadF function, leading to heap-based buffer overflows.
http://www.securityfocus.com/archive/1/513022/100/0/threaded
http://www.mandriva.com/security/advisories?name=MDVSA-2010:179