CVE-2019-20021: Fedoraproject Fedora

Medium severity, CVSS 5.5. EPSS: 1.1% chance of exploitation in the next 30 days.

A heap-based buffer over-read was discovered in canUnpack in p_mach.cpp in UPX 3.95 via a crafted Mach-O file.

Affected products

• Fedoraproject Fedora: version 30 only; version 31 only
• Upx Upx: version 3.95 only

Published 2019-12-27. Last modified 2026-06-17.