{"id":"CVE-2026-20338","state":"PUBLISHED","title":"ClamAV ZIP File Format Processing Memory Corruption Vulnerability","description":"A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device.\r\n\r\nThis 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. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate as a result of a memory double-free, resulting in a DoS condition on the affected software.","publishedAt":"2026-08-07T16:41:55.354Z","updatedAt":"2026-08-07T18:12:13.836Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"cisco"},"assigner":"cisco","products":["Cisco Cisco Secure Endpoint"],"affected":[{"vendor":"Cisco","product":"Cisco Secure Endpoint","defaultStatus":"unknown","versions":[{"version":"7.0.5","status":"affected"},{"version":"6.2.19","status":"affected"},{"version":"7.3.3","status":"affected"},{"version":"7.2.13","status":"affected"},{"version":"6.1.5","status":"affected"},{"version":"6.3.1","status":"affected"},{"version":"6.2.5","status":"affected"},{"version":"7.3.5","status":"affected"},{"version":"6.2.1","status":"affected"},{"version":"7.2.7","status":"affected"},{"version":"7.1.1","status":"affected"},{"version":"6.3.5","status":"affected"},{"version":"6.2.9","status":"affected"},{"version":"7.3.1","status":"affected"},{"version":"6.1.7","status":"affected"},{"version":"7.2.11","status":"affected"},{"version":"7.2.3","status":"affected"},{"version":"7.1.5","status":"affected"},{"version":"6.3.3","status":"affected"},{"version":"7.3.9","status":"affected"},{"version":"6.2.3","status":"affected"},{"version":"6.1.9","status":"affected"},{"version":"6.0.9","status":"affected"},{"version":"7.2.5","status":"affected"},{"version":"6.0.7","status":"affected"},{"version":"6.3.7","status":"affected"},{"version":"1.12.3","status":"affected"},{"version":"1.8.0","status":"affected"},{"version":"1.11.1","status":"affected"},{"version":"1.12.4","status":"affected"},{"version":"1.10.0","status":"affected"},{"version":"1.12.0","status":"affected"},{"version":"1.8.1","status":"affected"},{"version":"1.10.1","status":"affected"},{"version":"1.12.1","status":"affected"},{"version":"1.12.6","status":"affected"},{"version":"1.14.0","status":"affected"},{"version":"1.10.2","status":"affected"},{"version":"1.12.7","status":"affected"},{"version":"1.12.2","status":"affected"},{"version":"1.6.0","status":"affected"},{"version":"1.9.0","status":"affected"},{"version":"1.11.0","status":"affected"},{"version":"1.7.0","status":"affected"},{"version":"1.13.0","status":"affected"},{"version":"1.8.4","status":"affected"},{"version":"1.13.1","status":"affected"},{"version":"1.9.1","status":"affected"},{"version":"1.12.5","status":"affected"},{"version":"1.13.2","status":"affected"},{"version":"8.1.7.21512","status":"affected"},{"version":"8.1.7","status":"affected"},{"version":"8.1.5","status":"affected"},{"version":"8.1.3.21242","status":"affected"},{"version":"8.1.3","status":"affected"},{"version":"8.1.5.21322","status":"affected"},{"version":"8.1.7.21417","status":"affected"},{"version":"1.14.1","status":"affected"},{"version":"1.15.1","status":"affected"},{"version":"1.15.2","status":"affected"},{"version":"1.15.3","status":"affected"},{"version":"1.15.4","status":"affected"},{"version":"1.15.5","status":"affected"},{"version":"1.15.6","status":"affected"},{"version":"1.16.0","status":"affected"},{"version":"1.16.1","status":"affected"},{"version":"1.16.2","status":"affected"},{"version":"1.16.3","status":"affected"},{"version":"1.18.0","status":"affected"},{"version":"1.18.1","status":"affected"},{"version":"1.20.0","status":"affected"},{"version":"1.21.0","status":"affected"},{"version":"1.21.1","status":"affected"},{"version":"1.21.2","status":"affected"},{"version":"1.21.3","status":"affected"},{"version":"1.22.0","status":"affected"},{"version":"1.22.1","status":"affected"},{"version":"1.22.2","status":"affected"},{"version":"1.22.3","status":"affected"},{"version":"1.22.4","status":"affected"},{"version":"1.24.0","status":"affected"},{"version":"1.24.1","status":"affected"},{"version":"1.24.2","status":"affected"},{"version":"1.24.3","status":"affected"},{"version":"1.24.4","status":"affected"},{"version":"1.26.0","status":"affected"},{"version":"1.24.5","status":"affected"},{"version":"1.26.1","status":"affected"},{"version":"1.27.0","status":"affected"},{"version":"1.15.0","status":"affected"},{"version":"1.17.0","status":"affected"},{"version":"1.17.1","status":"affected"},{"version":"1.17.2","status":"affected"},{"version":"1.19.0","status":"affected"},{"version":"1.20.1","status":"affected"},{"version":"1.20.2","status":"affected"},{"version":"1.20.3","status":"affected"},{"version":"1.20.4","status":"affected"},{"version":"1.20.5","status":"affected"},{"version":"1.20.6","status":"affected"},{"version":"1.23.0","status":"affected"},{"version":"1.23.1","status":"affected"},{"version":"1.20.7","status":"affected"},{"version":"1.20.8","status":"affected"},{"version":"1.25.0","status":"affected"},{"version":"1.25.1","status":"affected"},{"version":"1.25.2","status":"affected"},{"version":"1.27.1","status":"affected"},{"version":"1.27.2","status":"affected"},{"version":"7.3.13","status":"affected"},{"version":"7.3.15","status":"affected"},{"version":"7.4.1","status":"affected"},{"version":"7.4.1.20425","status":"affected"},{"version":"7.4.1.20439","status":"affected"},{"version":"7.4.3","status":"affected"},{"version":"7.4.3.20679","status":"affected"},{"version":"7.4.5","status":"affected"},{"version":"7.5.1.20813","status":"affected"},{"version":"7.5.1.20833","status":"affected"},{"version":"7.5.3","status":"affected"},{"version":"7.5.5","stat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ZIP File Format Processing Memory Corruption Vulnerability","descriptions":[{"lang":"en","value":"A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device.\r\n\r\nThis 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. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate as a result of a memory double-free, resulting in a DoS condition on the affected software."}],"affected":[{"vendor":"Cisco","product":"Cisco Secure Endpoint","defaultStatus":"unknown","versions":[{"version":"7.0.5","status":"affected"},{"version":"6.2.19","status":"affected"},{"version":"7.3.3","status":"affected"},{"version":"7.2.13","status":"affected"},{"version":"6.1.5","status":"affected"},{"version":"6.3.1","status":"affected"},{"version":"6.2.5","status":"affected"},{"version":"7.3.5","status":"affected"},{"version":"6.2.1","status":"affected"},{"version":"7.2.7","status":"affected"},{"version":"7.1.1","status":"affected"},{"version":"6.3.5","status":"affected"},{"version":"6.2.9","status":"affected"},{"version":"7.3.1","status":"affected"},{"version":"6.1.7","status":"affected"},{"version":"7.2.11","status":"affected"},{"version":"7.2.3","status":"affected"},{"version":"7.1.5","status":"affected"},{"version":"6.3.3","status":"affected"},{"version":"7.3.9","status":"affected"},{"version":"6.2.3","status":"affected"},{"version":"6.1.9","status":"affected"},{"version":"6.0.9","status":"affected"},{"version":"7.2.5","status":"affected"},{"version":"6.0.7","status":"affected"},{"version":"6.3.7","status":"affected"},{"version":"1.12.3","status":"affected"},{"version":"1.8.0","status":"affected"},{"version":"1.11.1","status":"affected"},{"version":"1.12.4","status":"affected"},{"version":"1.10.0","status":"affected"},{"version":"1.12.0","status":"affected"},{"version":"1.8.1","status":"affected"},{"version":"1.10.1","status":"affected"},{"version":"1.12.1","status":"affected"},{"version":"1.12.6","status":"affected"},{"version":"1.14.0","status":"affected"},{"version":"1.10.2","status":"affected"},{"version":"1.12.7","status":"affected"},{"version":"1.12.2","status":"affected"},{"version":"1.6.0","status":"affected"},{"version":"1.9.0","status":"affected"},{"version":"1.11.0","status":"affected"},{"version":"1.7.0","status":"affected"},{"version":"1.13.0","status":"affected"},{"version":"1.8.4","status":"affected"},{"version":"1.13.1","status":"affected"},{"version":"1.9.1","status":"affected"},{"version":"1.12.5","status":"affected"},{"version":"1.13.2","status":"affected"},{"version":"8.1.7.21512","status":"affected"},{"version":"8.1.7","status":"affected"},{"version":"8.1.5","status":"affected"},{"version":"8.1.3.21242","status":"affected"},{"version":"8.1.3","status":"affected"},{"version":"8.1.5.21322","status":"affected"},{"version":"8.1.7.21417","status":"affected"},{"version":"1.14.1","status":"affected"},{"version":"1.15.1","status":"affected"},{"version":"1.15.2","status":"affected"},{"version":"1.15.3","status":"affected"},{"version":"1.15.4","status":"affected"},{"version":"1.15.5","status":"affected"},{"version":"1.15.6","status":"affected"},{"version":"1.16.0","status":"affected"},{"version":"1.16.1","status":"affected"},{"version":"1.16.2","status":"affected"},{"version":"1.16.3","status":"affected"},{"version":"1.18.0","status":"affected"},{"version":"1.18.1","status":"affected"},{"version":"1.20.0","status":"affected"},{"version":"1.21.0","status":"affected"},{"version":"1.21.1","status":"affected"},{"version":"1.21.2","status":"affected"},{"version":"1.21.3","status":"affected"},{"version":"1.22.0","status":"affected"},{"version":"1.22.1","status":"affected"},{"version":"1.22.2","status":"affected"},{"version":"1.22.3","status":"affected"},{"version":"1.22.4","status":"affected"},{"version":"1.24.0","status":"affected"},{"version":"1.24.1","status":"affected"},{"version":"1.24.2","status":"affected"},{"version":"1.24.3","status":"affected"},{"version":"1.24.4","status":"affected"},{"version":"1.26.0","status":"affected"},{"version":"1.24.5","status":"affected"},{"version":"1.26.1","status":"affected"},{"version":"1.27.0","status":"affected"},{"version":"1.15.0","status":"affected"},{"version":"1.17.0","status":"affected"},{"version":"1.17.1","status":"affected"},{"version":"1.17.2","status":"affected"},{"version":"1.19.0","status":"affected"},{"version":"1.20.1","status":"affected"},{"version":"1.20.2","status":"affected"},{"version":"1.20.3","status":"affected"},{"version":"1.20.4","status":"affected"},{"version":"1.20.5","status":"affected"},{"version":"1.20.6","status":"affected"},{"version":"1.23.0","status":"affected"},{"version":"1.23.1","status":"affected"},{"version":"1.20.7","status":"affected"},{"version":"1.20.8","status":"affected"},{"version":"1.25.0","status":"affected"},{"version":"1.25.1","status":"affected"},{"version":"1.25.2","status":"affected"},{"version":"1.27.1","status":"affected"},{"version":"1.27.2","status":"affected"},{"version":"7.3.13","status":"affected"},{"version":"7.3.15","status":"affected"},{"version":"7.4.1","status":"affected"},{"version":"7.4.1.20425","status":"affected"},{"version":"7.4.1.20439","status":"affected"},{"version":"7.4.3","status":"affected"},{"version":"7.4.3.20679","status":"affected"},{"version":"7.4.5","status":"affected"},{"version":"7.5.1.20813","status":"affected"},{"version":"7.5.1.20833","status":"affected"},{"version":"7.5.3","status":"affected"},{"version":"7.5.5","stat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Free","type":"cwe"}]}],"providerMetadata":{"shortName":"cisco","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateUpdated":"2026-08-07T16:41:55.354Z"},"exploits":[{"lang":"en","value":"The Cisco PSIRT is aware that proof-of-concept exploit code is available for the vulnerabilities that are described in CVE-2026-20337 and CVE-2026-20338.\r\n\r\nThe Cisco PSIRT is not aware of proof-of-concept exploit code for any of the other vulnerabilities that are described in this advisory.\r\nThe Cisco PSIRT is not aware of any malicious use of the vulnerabilities that are described in this advisory."}],"source":{"advisory":"cisco-sa-clamav-WuuvVd26","discovery":"EXTERNAL","defects":["CSCwv57797"]}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-07T18:12:05.989495Z","id":"CVE-2026-20338","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-07T18:12:13.836Z"}}]}}}