CVE-2018-18584: Cabextract Project Cabextract

Medium severity, CVSS 6.5. EPSS: 3.1% chance of exploitation in the next 30 days.

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.

Affected products

• Cabextract Project Cabextract: before 1.8 (fixed in 1.8)
• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 16.04 only; version 18.04 only; version 18.10 only
• Debian Debian Linux: version 8.0 only
• Libmspack Project Libmspack: version 0.3 only; version 0.4 only; version 0.5 only; version 0.6 only; version 0.7 only; version 0.7.1 only
• Red Hat Enterprise Linux: version 7.0 only
• Starwindsoftware Starwind Virtual San: affected versions not specified
• Suse Linux Enterprise Server: version 11 only; version 12 only

Published 2018-10-23. Last modified 2026-06-17.