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Vulnerability record · CVE-2026-20348 · published 7 August 2026

CVE-2026-20348: Cisco secure endpoint classic buffer overflow vulnerability

Cisco · Secure Endpoint

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.

7.5 CVSS 3.1 High EPSS 0.46% · top 62.5% CWE-120 · Classic buffer overflow
7.5CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
19 Aug 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-20032Cisco secure endpoint classic buffer overflow vulnerabilityOn Feb 15, 2023, the following vulnerability in the ClamAV scanning library was disclosed: A vulnerability in the HFS+ partition file parser of ClamA…EPSS 29%7.5CVE-2026-20217Cisco secure endpoint classic buffer overflow vulnerabilityA vulnerability in the PESpin file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly othe…EPSS 0.57%7.5CVE-2026-20243Cisco secure endpoint classic buffer overflow vulnerabilityA vulnerability in the ALZ file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other e…EPSS 0.57%7.5CVE-2026-20244Cisco secure endpoint classic buffer overflow vulnerabilityA vulnerability in the DMG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other e…EPSS 0.57%7.5CVE-2026-20213Cisco secure endpoint classic buffer overflow vulnerabilityA vulnerability in the PE file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other ex…EPSS 0.57%7.5CVE-2026-20214Cisco secure endpoint classic buffer overflow vulnerabilityA vulnerability in the FSG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other e…EPSS 0.57%7.5CVE-2026-20215Cisco secure endpoint classic buffer overflow vulnerabilityA vulnerability in the 7z file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other ex…EPSS 0.57%7.5CVE-2026-20216Cisco secure endpoint allocation without limits vulnerabilityA vulnerability in the InstallShield file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affe…EPSS 0.57%

Source: NIST National Vulnerability Database (record CVE-2026-20348), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.