CVE-2026-20338: ClamAV ZIP File Format Processing Memory Corruption Vulnerability

Published Aug 7, 2026
·
Updated

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.

Affected Software

1 affected component
clamav clamav

Event History

Aug 7, 2026
CVE Published
via MITRE·04:41 PM
Data Sourced
via MITRE·04:41 PM
DescriptionSeverityWeakness
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Frequently Asked Questions

1

What is the severity of CVE-2026-20338?

The severity of CVE-2026-20338 is rated as high with a score of 7.5.

2

What impact does CVE-2026-20338 have on ClamAV?

CVE-2026-20338 can lead to a denial of service condition on affected devices due to memory corruption.

3

How do I fix CVE-2026-20338?

To fix CVE-2026-20338, update ClamAV to the latest version that addresses this vulnerability.

4

What type of attacks are possible with CVE-2026-20338?

An unauthenticated, remote attacker could exploit CVE-2026-20338 to crash the ClamAV service.

5

What causes the vulnerability in CVE-2026-20338?

CVE-2026-20338 is caused by improper memory handling in the zip archive parser during the scanning process.

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CVE-2026-20338 - ClamAV ZIP File Format Processing Memory Corruption Vulnerability - SecAlerts