Multiple buffer overflows in libpng 1.2.5 and earlier, as used in multiple products, allow remote attackers to execute arbitrary code via malformed PNG images in which (1) the pnghandletRNS function does not properly validate the length of transparency chunk (tRNS) data, or the (2) pnghandlesBIT or (3) pnghandlehIST functions do not perform sufficient bounds checking.

Heap-based buffer overflow in Microsoft MSN Messenger 6.2, 7.0, and 7.5, and Live Messenger 8.0 allows user-assisted remote attackers to execute arbitrary code via unspecified vectors involving video conversation handling in Web Cam and video chat sessions.

GIF file validation error in MSN Messenger 6.2 allows remote attackers in a user's contact list to execute arbitrary code via a GIF image with an improper height and width.