What’s Vulnerable › Vulnerabilities
CVE-2026-20348: ClamAV XAR File Format Processing Memory Corruption Vulnerability
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-07 · updated 2026-10-23
- Weakness: CWE-120
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.
Affected products
- Cisco Secure Endpoint: before 1.27.4; before 1.29.2; before 7.5.24.21780; from 8.0.0 before 8.6.3 — fixed in 1.27.4, 1.29.2, 7.5.24.21780, 8.6.3
How to fix
Upgrade to a fixed version: Cisco Secure Endpoint 1.27.4, 1.29.2, 7.5.24.21780, 8.6.3. Check the vendor advisory for mitigations.
References
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