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.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.A vulnerability in ClamAV versions prior to 0.100.2 could allow an attacker to cause a denial of service condition. The vulnerability is due to an error related to the MEW unpacker within the "unmew11" function , which can be exploited to trigger an invalid read memory access via a specially crafted EXE file.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 .