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#ClamAV
Understanding and Defending Against CVE-2026-20345: ClamAV GPT File Format Parser Vulnerability
CVE-2026-20345 is a high-severity vulnerability in the GPT file format parser of ClamAV, a popular open-source antivirus engine. This vulnerability allows an unauthenticated, remote attacker to cause a denial-of-service (DoS) condition or potentially lead to memory corruption on an affected device. The vulnerability is due to improper handling of an endian conversion operation, which may result in an out-of-bounds buffer write. This analysis will delve into the root cause, attack surface, exploitation mechanics, real-world impact, detection strategies, and defensive measures for this critical vulnerability.
CVE-2026-20339: ClamAV PESpin File Format Parser Vulnerability
A vulnerability in ClamAV's PESpin file format parser could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device. The vulnerability has a CVSS score of 7.5 and is not currently being actively exploited.
CVE-2026-20338: ClamAV Zip Archive Parser Denial of Service Vulnerability
A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper memory handling when processing content in zip files during scanning. An attacker could exploit this vulnerability by submitting a crafted zip file for scanning, potentially causing the ClamAV scanning process to terminate. Cisco Secure Endpoint and ClamAV are affected, with multiple versions impacted.