Vulnerability · Published Aug 7, 2026 · Assigned by cisco
CVE-2026-20338ClamAV ZIP File Format Processing Memory Corruption Vulnerability
High 7.5
In plain English
A high-severity double free in Cisco Secure Endpoint from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | clamav | 1.5.4+dfsg-0ubuntu0.22.04.1 | USN-8788-1 |
| Ubuntu:22.04:LTS | clamav | 1.5.4+dfsg-0ubuntu0.22.04.1 | UBUNTU-CVE-2026-20338 |
| Ubuntu:24.04:LTS | clamav | 1.5.4+dfsg-0ubuntu0.24.04.1 | USN-8788-1 |
| Ubuntu:24.04:LTS | clamav | 1.5.4+dfsg-0ubuntu0.24.04.1 | UBUNTU-CVE-2026-20338 |
| Ubuntu:26.04:LTS | clamav | 1.5.4+dfsg-0ubuntu0.26.04.1 | USN-8788-1 |
| Ubuntu:26.04:LTS | clamav | 1.5.4+dfsg-0ubuntu0.26.04.1 | UBUNTU-CVE-2026-20338 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Secure Endpoint | 7.0.56.2.197.3.37.2.136.1.56.3.16.2.57.3.5 |
Weakness: CWE-415 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H