CVE-2026-20348: A vulnerability in the XAR file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other exp...

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 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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.33%

25.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Cisco	Cisco Secure Endpoint	7.0.5; 6.2.19; 7.3.3; 7.2.13; 6.1.5; 6.3.1; 6.2.5; 7.3.5; 6.2.1; 7.2.7; 7.1.1; 6.3.5; 6.2.9; 7.3.1; 6.1.7; 7.2.11; 7.2.3; 7.1.5; 6.3.3; 7.3.9; 6.2.3; 6.1.9; 6.0.9; 7.2.5; 6.0.7; 6.3.7; 1.12.3; 1.8.0; 1.11.1; 1.12.4; 1.10.0; 1.12.0; 1.8.1; 1.10.1; 1.12.1; 1.12.6; 1.14.0; 1.10.2; 1.12.7; 1.12.2; 1.6.0; 1.9.0; 1.11.0; 1.7.0; 1.13.0; 1.8.4; 1.13.1; 1.9.1; 1.12.5; 1.13.2; 8.1.7.21512; 8.1.7; 8.1.5; 8.1.3.21242; 8.1.3; 8.1.5.21322; 8.1.7.21417; 1.14.1; 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; 1.18.0; 1.18.1; 1.20.0; 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; 1.24.0; 1.24.1; 1.24.2; 1.24.3; 1.24.4; 1.26.0; 1.24.5; 1.26.1; 1.27.0; 1.15.0; 1.17.0; 1.17.1; 1.17.2; 1.19.0; 1.20.1; 1.20.2; 1.20.3; 1.20.4; 1.20.5; 1.20.6; 1.23.0; 1.23.1; 1.20.7; 1.20.8; 1.25.0; 1.25.1; 1.25.2; 1.27.1; 1.27.2; 7.3.13; 7.3.15; 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; 7.5.3; 7.5.5; 8.0.1.21160; 8.0.1.21164; 7.5.7; 7.5.9; 7.5.11; 8.1.7.21585; 7.5.13.21586; 7.5.13.21598; 8.2.1.21612; 8.2.1.21650; 7.5.15.21611; 7.5.17.21680; 8.2.3.30119; 8.2.4.30130; 8.4.0; 7.5.19; 8.4.1.30298; 8.4.2.30317; 8.4.1.30307; 7.5.20; 8.4.3; 8.4.4.30419; 8.4.4.30467; 7.5.21.21732; 8.4.5.30483

References

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

Timeline

Published: Aug 7, 2026
Last Modified: Aug 11, 2026
Status: Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-20348?

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.

How severe is CVE-2026-20348?

CVE-2026-20348 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2026-20348?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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