NULL Pointer Dereference
An issue was discovered in Xpdf 4.01.01. There is a NULL pointer dereference in the function Gfx::opSetExtGState in Gfx.cc.
CWE-476 - NULL Pointer Dereference
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.