CVE-2006-4018: Clamav

High severity, CVSS 7.5. EPSS: 19.4% chance of exploitation in the next 30 days.

Heap-based buffer overflow in the pefromupx function in libclamav/upx.c in Clam AntiVirus (ClamAV) 0.81 through 0.88.3 allows remote attackers to execute arbitrary code via a crafted UPX packed file containing sections with large rsize values.

Affected products

• Clamav Clamav: version 0.81 only; version 0.82 only; version 0.83 only; version 0.84 only; version 0.85 only; version 0.85.1 only; …

Published 2006-08-08. Last modified 2026-06-16.