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CVE-2026-20338

ClamAV ZIP File Format Processing Memory Corruption Vulnerability

HIGH

7.5

CVSS Score

Published: August 7, 2026 at 04:41 PM UTC

Updated: October 23, 2026 at 08:10 PM UTC

1 product affected across 1 vendorSecure Endpoint

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Severity

HIGH7.5

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Secure Endpoint · Cisco

90%

1.10.0 1.10.1 1.10.2 1.11.0 1.11.1 1.12.0 1.12.1 1.12.2 1.12.3 1.12.4 1.12.5 1.12.6 1.12.7 1.13.0 1.13.1 1.13.2 1.14.0 1.14.1 1.15.0 1.15.1 1.15.2 1.15.3 1.15.4 1.15.5 1.15.6 1.16.0 1.16.1 1.16.2 1.16.3 1.17.0 1.17.1 1.17.2 1.18.0 1.18.1 1.19.0 1.20.0 1.20.1 1.20.2 1.20.3 1.20.4 1.20.5 1.20.6 1.20.7 1.20.8 1.21.0 1.21.1 1.21.2 1.21.3 1.22.0 1.22.1 1.22.2 1.22.3 1.22.4 1.23.0 1.23.1 1.24.0 1.24.1 1.24.2 1.24.3 1.24.4 1.24.5 1.25.0 1.25.1 1.25.2 1.26.0 1.26.1 1.27.0 1.27.1 1.27.2 1.6.0 1.7.0 1.8.0 1.8.1 1.8.4 1.9.0 1.9.1 6.0.7 6.0.9 6.1.5 6.1.7 6.1.9 6.2.1 6.2.19 6.2.3 6.2.5 6.2.9 6.3.1 6.3.3 6.3.5 6.3.7 7.0.5 7.1.1 7.1.5 7.2.11 7.2.13 7.2.3 7.2.5 7.2.7 7.3.1 7.3.13 7.3.15 7.3.3 7.3.5 7.3.9 7.4.1 7.4.1.20425 7.4.1.20439 7.4.3 7.4.3.20679 7.4.5 7.5.1.20813 7.5.1.20833 7.5.11 7.5.13.21586 7.5.13.21598 7.5.15.21611 7.5.17.21680 7.5.19 7.5.20 7.5.21.21732 7.5.3 7.5.5 7.5.7 7.5.9 8.0.1.21160 8.0.1.21164 8.1.3 8.1.3.21242 8.1.5 8.1.5.21322 8.1.7 8.1.7.21417 8.1.7.21512 8.1.7.21585 8.2.1.21612 8.2.1.21650 8.2.3.30119 8.2.4.30130 8.4.0 8.4.1.30298 8.4.1.30307 8.4.2.30317 8.4.3 8.4.4.30419 8.4.4.30467 8.4.5.30483

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHcisco

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusAWAITING ANALYSIS

CWE

CWE-415

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