CVE-2026-20243
Description
A flaw was found in ClamAV's ALZ file format parser. An unauthenticated, remote attacker can exploit this vulnerability by submitting a specially crafted ALZ (Archived Link Zipped) file for scanning. This improper handling of ALZ files can lead to memory corruption, causing the ClamAV scanning process to terminate. A successful exploit results in a Denial of Service (DoS) condition on the affected software.
Statement
This flaw in ClamAV's ALZ file parser is rated as Important as it allows an unauthenticated, remote attacker to trigger a denial of service. By submitting a specially crafted ALZ file for scanning, an attacker can cause memory corruption, leading to the termination of the ClamAV scanning process. This could disrupt services relying on ClamAV for malware detection in Red Hat environments.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
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