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.
Created cabextract tracking bugs for this issue:
Affects: epel-all [bug 1644222]
Affects: fedora-all [bug 1644221]
Created libmspack tracking bugs for this issue:
Affects: epel-all [bug 1644219]
Affects: fedora-all [bug 1644218]
This issue affects the versions of libmspack as shipped with Red Hat Enterprise Linux 7.
This issue has been addressed in the following products:
Red Hat Enterprise Linux 7
Via RHSA-2019:2049 https://access.redhat.com/errata/RHSA-2019:2049
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):