In mspack/cab.h in libmspack before 0.8alpha and cabextract before 1.8, the CAB block input buffer is one byte too small for the maximal Quantum block, leading to an out-of-bounds write.

The cabdextract function in cabd.c in libmspack before 0.5 does not properly maintain decompression callbacks in certain cases where an invalid file follows a valid file, which allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted CAB archive.

Integer overflow in the qtmddecompress function in libmspack 0.4 allows remote attackers to cause a denial of service (hang) via a crafted CAB file, which triggers an infinite loop.