CVE-2026-20338

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.

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

No history.

Information

Published : 2026-08-07 17:17

Updated : 2026-08-11 18:54

NVD link : CVE-2026-20338

Mitre link : CVE-2026-20338

CVE.ORG link : CVE-2026-20338

JSON object : View

Products Affected

No product.

CWE

CWE-415

Double Free

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{"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"}], "defaultStatus": "unknown"}]}], "published": "2026-08-07T17:17:02.610", "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-415"}]}], "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."}], "lastModified": "2026-08-11T18:54:19.877", "sourceIdentifier": "psirt@cisco.com"}