Foxit Reader, Enterprise Reader, and PhantomPDF before 7.1 allow remote attackers to cause a denial of service (memory corruption and crash) via a crafted (1) Ubyte Size in a DataSubBlock structure or (2) LZWMinimumCodeSize in a GIF image.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.