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.
Microsoft MSN Messenger 6.0 and 6.1 does not properly handle certain requests, which allows remote attackers to read arbitrary files.