CVE-2026-20244 ClamAV DMG File Processing Denial of Service Vulnerability

High 7.5 Published 1 Jul 2026 Updated 1 Jul 2026

An unauthenticated remote attacker can cause a denial of service in ClamAV by submitting a crafted DMG file that triggers an integer overflow during scanning.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-20244?

CVE-2026-20244 is a high-severity vulnerability in Clamav Clamav, published on 1 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-120

Which versions are affected by CVE-2026-20244?

It affects 2 products.

Products include Cisco Secure Endpoint, Clamav Clamav.

How do I fix CVE-2026-20244?

Apply the vendor's patch.

Is CVE-2026-20244 being exploited?

There is no known exploitation of CVE-2026-20244 in the wild and no public exploit code.

All Clamav Clamav vulnerabilities

Sources

Also known as DEBIAN-CVE-2026-20244, GHSA-7wm4-rx33-g4hj, MINI-4q4q-hfh9-p8r6, MINI-5phj-hf9v-2c9w, UBUNTU-CVE-2026-20244.