CVE-2026-20348
Published:August 07, 2026
Updated:September 01, 2026
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 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.
Affected Packages
https://github.com/Cisco-Talos/clamav.git (GITHUB):
Affected version(s) >=clamav-0.98.1 <clamav-1.4.6Fix Suggestion:
Update to version clamav-1.4.6https://github.com/Cisco-Talos/clamav.git (GITHUB):
Affected version(s) >=clamav-1.5.0 <clamav-1.5.4Fix Suggestion:
Update to version clamav-1.5.4Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (1)
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Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
EPSS
Base Score:
0.46