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.

An issue was discovered in mspack/chmd.c in libmspack before 0.7alpha. There is an off-by-one error in the CHM PMGI/PMGL chunk number validity checks, which could lead to denial of service (uninitialized data dereference and application crash).

An issue was discovered in mspack/chmd.c in libmspack before 0.7alpha. There is an off-by-one error in the TOLOWER() macro for CHM decompression.

An issue was discovered in mspack/chmd.c in libmspack before 0.7alpha. It does not reject blank CHM filenames.

An issue was discovered in kwajd_read_headers in mspack/kwajd.c in libmspack before 0.7alpha. Bad KWAJ file header extensions could cause a one or two byte overwrite.

Integer signedness error in the Quantum decompressor in cabextract before 1.3, when archive test mode is used, allows user-assisted remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted Quantum archive in a .cab file, related to the libmspack library.

The MS-ZIP decompressor in cabextract before 1.3 allows remote attackers to cause a denial of service (infinite loop) via a malformed MSZIP archive in a .cab file during a (1) test or (2) extract action, related to the libmspack library.

Directory traversal vulnerability in cabextract before 1.1 allows remote attackers to overwrite arbitrary files via a cabinet file containing .. (dot dot) sequences in a filename.