A global buffer overflow in OptiPNG 0.7.6 allows remote attackers to cause a denial-of-service attack or other unspecified impact with a maliciously crafted GIF format file, related to an uncontrolled loop in the LZWReadByte function of the gifread.c file.

Integer overflow bug in function minitiff_read_info() of optipng 0.7.6 allows an attacker to remotely execute code or cause denial of service.