CVE-2020-27798: Upx

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

An invalid memory address reference was discovered in the adjABS function in p_lx_elf.cpp in UPX 4.0.0 via a crafted Mach-O file.

Affected products

• Upx Upx: version 4.0.0 only

Published 2022-08-25. Last modified 2026-06-17.