Bug 2496095 (CVE-2026-20244)

Summary: CVE-2026-20244 clamav: ClamAV: Denial of Service via crafted DMG file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in ClamAV's DMG file format parser. An unauthenticated, remote attacker can exploit this vulnerability by submitting a specially crafted DMG file for scanning. Improper boundary checks during the scanning process can lead to an integer overflow, primarily affecting 32-bit platforms. A successful exploit could cause the ClamAV scanning process to terminate, resulting in a Denial of Service (DoS) condition.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2496842, 2496843    
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Description OSIDB Bzimport 2026-07-01 18:02:14 UTC 
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.