CVE-2026-20348

ClamAV XAR File Format Processing Memory Corruption Vulnerability

Published Aug 7, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
A vulnerability in the XAR 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&nbsp;memory corruption on an affected device.

This vulnerability is due to improper boundary checks for content in XAR files during scanning. An attacker could exploit this vulnerability by submitting a crafted file that contains XAR 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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4852-1 clamav security update
History
Type Values Removed Values Added
CPEs cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:linux:*:*
cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:macos:*:*
cpe:2.3:a:cisco:secure_endpoint:*:*:*:*:*:windows:*:*
Type Values Removed Values Added
First Time appeared Cisco
Cisco secure Endpoint
Vendors & Products Cisco
Cisco secure Endpoint
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A vulnerability in the XAR 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&nbsp;memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in XAR files during scanning. An attacker could exploit this vulnerability by submitting a crafted file that contains XAR 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.
Title ClamAV XAR File Format Processing Memory Corruption Vulnerability
Weaknesses CWE-120
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
cisco
Published
Updated
Aug 7, 2026, 9:02 PM
Reserved
Oct 8, 2025, 11:59 AM
Status
Analyzed
Published
Aug 7, 2026, 5:17 PM
Modified
Oct 23, 2026, 8:10 PM