CVE-2026-20338
Full vulnerability record from the local CVENow database.
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. 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. 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.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-08-07 17:17:02.610000
Last modified
2026-10-23 20:10:00.160000
View original CVE JSON
{
"id": "CVE-2026-20338",
"sourceIdentifier": "[email protected]",
"published": "2026-08-07T17:17:02.610",
"lastModified": "2026-10-23T20:10:00.160",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"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."
},
{
"lang": "es",
"value": "Una vulnerabilidad en el analizador de archivos zip de ClamAV podría permitir a un atacante remoto no autenticado causar una condición de DoS en un dispositivo afectado.\n\nEsta vulnerabilidad se debe a un manejo inadecuado de la memoria al procesar contenido en archivos zip durante el escaneo. Un atacante podría explotar esta vulnerabilidad al enviar un archivo zip manipulado para su escaneo. Un exploit exitoso podría permitir al atacante causar la terminación del proceso de escaneo de ClamAV como resultado de una doble liberación de memoria, lo que resultaría en una condición de DoS en el software afectado."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"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",
"status": "affected"
},
{
"version": "8.0.1.21160",
"status": "affected"
},
{
"version": "8.0.1.21164",
"status": "affected"
},
{
"version": "7.5.7",
"status": "affected"
},
{
"version": "7.5.9",
"status": "affected"
},
{
"version": "7.5.11",
"status": "affected"
},
{
"version": "8.1.7.21585",
"status": "affected"
},
{
"version": "7.5.13.21586",
"status": "affected"
},
{
"version": "7.5.13.21598",
"status": "affected"
},
{
"version": "8.2.1.21612",
"status": "affected"
},
{
"version": "8.2.1.21650",
"status": "affected"
},
{
"version": "7.5.15.21611",
"status": "affected"
},
{
"version": "7.5.17.21680",
"status": "affected"
},
{
"version": "8.2.3.30119",
"status": "affected"
},
{
"version": "8.2.4.30130",
"status": "affected"
},
{
"version": "8.4.0",
"status": "affected"
},
{
"version": "7.5.19",
"status": "affected"
},
{
"version": "8.4.1.30298",
"status": "affected"
},
{
"version": "8.4.2.30317",
"status": "affected"
},
{
"version": "8.4.1.30307",
"status": "affected"
},
{
"version": "7.5.20",
"status": "affected"
},
{
"version": "8.4.3",
"status": "affected"
},
{
"version": "8.4.4.30419",
"status": "affected"
},
{
"version": "8.4.4.30467",
"status": "affected"
},
{
"version": "7.5.21.21732",
"status": "affected"
},
{
"version": "8.4.5.30483",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-08-07T18:12:05.989495Z",
"id": "CVE-2026-20338",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-415"
}
]
}
],
"references": [
{
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26",
"source": "[email protected]"
}
]
}