CVE-2026-20347

A vulnerability in the Mach-O file format parser of ClamAV 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. This vulnerability is due to improper boundary checks for content in Mach-O files during scanning, which may result in an out-of-bounds buffer read. An attacker could exploit this vulnerability by submitting a crafted Mach-O file 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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26

Configurations

No configuration.

History

23 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) Una vulnerabilidad en el analizador de formato de archivo Mach-O de ClamAV podría permitir a un atacante remoto no autenticado causar una condición de DoS o posiblemente otros impactos expandidos como resultado de corrupción de memoria en un dispositivo afectado. Esta vulnerabilidad se debe a comprobaciones de límites inadecuadas para el contenido en archivos Mach-O durante el escaneo, lo que puede resultar en una lectura de búfer fuera de límites. Un atacante podría explotar esta vulnerabilidad al enviar un archivo Mach-O manipulado para ser escaneado por ClamAV en un dispositivo afectado. Un exploit exitoso podría permitir al atacante causar la terminación del proceso de escaneo de ClamAV, lo que resultaría en una condición de DoS en el software afectado.

Information

Published : 2026-08-07 17:17

Updated : 2026-10-23 20:10

NVD link : CVE-2026-20347

Mitre link : CVE-2026-20347

CVE.ORG link : CVE-2026-20347

JSON object : View

Products Affected

No product.

CWE

CWE-125

Out-of-bounds Read

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{"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": 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"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"}], "defaultStatus": "unknown"}]}], "published": "2026-08-07T17:17:03.337", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26", "source": "psirt@cisco.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "A vulnerability in the Mach-O file format parser of ClamAV 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.\r\n\r\nThis vulnerability is due to improper boundary checks for content in Mach-O files during scanning, which may result in an out-of-bounds buffer read. An attacker could exploit this vulnerability by submitting a crafted Mach-O file 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."}, {"lang": "es", "value": "Una vulnerabilidad en el analizador de formato de archivo Mach-O de ClamAV podr\u00eda permitir a un atacante remoto no autenticado causar una condici\u00f3n de DoS o posiblemente otros impactos expandidos como resultado de corrupci\u00f3n de memoria en un dispositivo afectado.\n\nEsta vulnerabilidad se debe a comprobaciones de l\u00edmites inadecuadas para el contenido en archivos Mach-O durante el escaneo, lo que puede resultar en una lectura de b\u00fafer fuera de l\u00edmites. Un atacante podr\u00eda explotar esta vulnerabilidad al enviar un archivo Mach-O manipulado para ser escaneado por ClamAV en un dispositivo afectado. Un exploit exitoso podr\u00eda permitir al atacante causar la terminaci\u00f3n del proceso de escaneo de ClamAV, lo que resultar\u00eda en una condici\u00f3n de DoS en el software afectado."}], "lastModified": "2026-10-23T20:10:00.160", "sourceIdentifier": "psirt@cisco.com"}