CVE-2026-20244
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk31th percentile — higher than 31% of all known CVEs
Summary
A vulnerability in the DMG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) or other impacts due to memory corruption on an affected device. The issue stems from improper boundary checks during DMG scanning, leading to an integer overflow on 32-bit platforms only.
Risk Assessment
An attacker can submit a crafted DMG file for scanning by ClamAV, causing the scanning process to terminate and thus preventing threat detection. This can disrupt email or file protection systems, increasing the risk of malware infection.
Recommendation
Immediately update ClamAV to a version containing the fix for CVE-2026-20244. If an update is not possible, consider temporarily disabling DMG file scanning on 32-bit platforms or applying other mitigations.
Original NVD description (English source)
A vulnerability in the DMG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in DMG files during scanning, which may result in an integer overflow on 32-bit platforms only. An attacker could exploit this vulnerability by submitting a crafted file that contains DMG content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.