CVE-2026-20339

A vulnerability in the PESpin 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 PESpin files during scanning, which may result in an integer overflow. An attacker could exploit this vulnerability by submitting a crafted file that contains PESpin content 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

No history.

Information

Published : 2026-08-07 17:17

Updated : 2026-08-11 18:54

NVD link : CVE-2026-20339

Mitre link : CVE-2026-20339

CVE.ORG link : CVE-2026-20339

JSON object : View

Products Affected

No product.

CWE

CWE-190

Integer Overflow or Wraparound

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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", 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"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": "2026-08-07T17:17:02.807", "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-190"}]}], "descriptions": [{"lang": "en", "value": "A vulnerability in the PESpin 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 PESpin files during scanning, which may result in an integer overflow. An attacker could exploit this vulnerability by submitting a crafted file that contains PESpin content 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."}], "lastModified": "2026-08-11T18:54:19.877", "sourceIdentifier": "psirt@cisco.com"}