Arbitrary code execution in Mozilla Firefox before 3.0.15 and 3.5.x before 3.5.4, and SeaMonkey before 2.0 ia a crafted regular expression in a Proxy Auto-configuration (PAC) file.
Heap-based buffer overflow in the GIF image parser in Mozilla Firefox before 3.0.15 and 3.5.x before 3.5.4, and SeaMonkey before 2.0 via unspecified vectors.