CVE-2026-20338

HIGH

CVE: CVE-2026-20338 - A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affect...Sign in to save

CVSS

7.5

CVSS v3.1

EPSS

0.3%

Exploit Prediction Score

Published

August 7, 2026

Exploitability

EPSS probability 0.3%

Description

A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper memory handling when processing content in zip files during scanning. An attacker could exploit this vulnerability by submitting a crafted zip file for scanning. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate as a result of a memory double-free, resulting in a DoS condition on the affected software.

Weaknesses

CWE-415

Affected Packages

No package data available.

Aliases

CVE-2026-20338

Related references

Publisher and database URLs for this record (shown for attribution; reading stays in Bugflare).

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