ClamAV ZIP File Format Processing Memory Corruption Vulnerability
CVE-2026-20338 is fixed in 9 products on 1 platform, first by clamav 1.5.4+dfsg-0ubuntu0.22.04.1, released August 7, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| clamav · Ubuntu 22.04.1 LTS (jammy) | 1.5.4+dfsg-0ubuntu0.22.04.1 | clamav 1.5.4+dfsg-0ubuntu0.22.04.1 | Aug 7, 2026 |
| clamav · Ubuntu 24.04.5 LTS (noble) | 1.5.4+dfsg-0ubuntu0.24.04.1 | clamav 1.5.4+dfsg-0ubuntu0.24.04.1 | Aug 7, 2026 |
| clamav · Ubuntu 26.04.1 LTS (resolute) | 1.5.4+dfsg-0ubuntu0.26.04.1 | clamav 1.5.4+dfsg-0ubuntu0.26.04.1 | Aug 7, 2026 |
| clamav · opensuse-leap 16.0 | 1.5.4-160000.1.1 | OPENSUSE-SU-2026:21831-1 | Sep 11, 2026 |
| clamav · sles 15.6 | 1.5.4-150600.18.31.1 | SUSE-SU-2026:4180-1 | Sep 14, 2026 |
| clamav · sles 15.7 | 1.5.4-150600.18.31.1 | SUSE-SU-2026:4180-1 | Sep 14, 2026 |
| clamav · sles 16.0 | 1.5.4-160000.1.1 | SUSE-SU-2026:23727-1 | Sep 11, 2026 |
| clamav-base · Ubuntu 22.04.1 LTS (jammy) | 1.5.4+dfsg-0ubuntu0.22.04.1 | clamav-base 1.5.4+dfsg-0ubuntu0.22.04.1 | Aug 7, 2026 |
| clamav-base · Ubuntu 24.04.5 LTS (noble) | 1.5.4+dfsg-0ubuntu0.24.04.1 | clamav-base 1.5.4+dfsg-0ubuntu0.24.04.1 | Aug 7, 2026 |
| clamav-base · Ubuntu 26.04.1 LTS (resolute) | 1.5.4+dfsg-0ubuntu0.26.04.1 | clamav-base 1.5.4+dfsg-0ubuntu0.26.04.1 | Aug 7, 2026 |
| clamav-daemon · Ubuntu 22.04.1 LTS (jammy) | 1.5.4+dfsg-0ubuntu0.22.04.1 | clamav-daemon 1.5.4+dfsg-0ubuntu0.22.04.1 | Aug 7, 2026 |
| clamav-daemon · Ubuntu 24.04.5 LTS (noble) | 1.5.4+dfsg-0ubuntu0.24.04.1 | clamav-daemon 1.5.4+dfsg-0ubuntu0.24.04.1 | Aug 7, 2026 |
| clamav-daemon · Ubuntu 26.04.1 LTS (resolute) | 1.5.4+dfsg-0ubuntu0.26.04.1 | clamav-daemon 1.5.4+dfsg-0ubuntu0.26.04.1 | Aug 7, 2026 |
| clamav-docs · Ubuntu 22.04.1 LTS (jammy) | 1.5.4+dfsg-0ubuntu0.22.04.1 | clamav-docs 1.5.4+dfsg-0ubuntu0.22.04.1 | Aug 7, 2026 |
| clamav-docs · Ubuntu 24.04.5 LTS (noble) | 1.5.4+dfsg-0ubuntu0.24.04.1 | clamav-docs 1.5.4+dfsg-0ubuntu0.24.04.1 | Aug 7, 2026 |
| clamav-docs · Ubuntu 26.04.1 LTS (resolute) | 1.5.4+dfsg-0ubuntu0.26.04.1 | clamav-docs 1.5.4+dfsg-0ubuntu0.26.04.1 | Aug 7, 2026 |
| clamav-freshclam · Ubuntu 22.04.1 LTS (jammy) | 1.5.4+dfsg-0ubuntu0.22.04.1 | clamav-freshclam 1.5.4+dfsg-0ubuntu0.22.04.1 | Aug 7, 2026 |
| clamav-freshclam · Ubuntu 24.04.5 LTS (noble) | 1.5.4+dfsg-0ubuntu0.24.04.1 | clamav-freshclam 1.5.4+dfsg-0ubuntu0.24.04.1 | Aug 7, 2026 |
| clamav-freshclam · Ubuntu 26.04.1 LTS (resolute) | 1.5.4+dfsg-0ubuntu0.26.04.1 | clamav-freshclam 1.5.4+dfsg-0ubuntu0.26.04.1 | Aug 7, 2026 |
| clamav-milter · Ubuntu 22.04.1 LTS (jammy) | 1.5.4+dfsg-0ubuntu0.22.04.1 | clamav-milter 1.5.4+dfsg-0ubuntu0.22.04.1 | Aug 7, 2026 |
| clamav-milter · Ubuntu 24.04.5 LTS (noble) | 1.5.4+dfsg-0ubuntu0.24.04.1 | clamav-milter 1.5.4+dfsg-0ubuntu0.24.04.1 | Aug 7, 2026 |
| clamav-milter · Ubuntu 26.04.1 LTS (resolute) | 1.5.4+dfsg-0ubuntu0.26.04.1 | clamav-milter 1.5.4+dfsg-0ubuntu0.26.04.1 | Aug 7, 2026 |
| clamav-testfiles · Ubuntu 22.04.1 LTS (jammy) | 1.5.4+dfsg-0ubuntu0.22.04.1 | clamav-testfiles 1.5.4+dfsg-0ubuntu0.22.04.1 | Aug 7, 2026 |
| clamav-testfiles · Ubuntu 24.04.5 LTS (noble) | 1.5.4+dfsg-0ubuntu0.24.04.1 | clamav-testfiles 1.5.4+dfsg-0ubuntu0.24.04.1 | Aug 7, 2026 |
| clamav-testfiles · Ubuntu 26.04.1 LTS (resolute) | 1.5.4+dfsg-0ubuntu0.26.04.1 | clamav-testfiles 1.5.4+dfsg-0ubuntu0.26.04.1 | Aug 7, 2026 |
| clamdscan · Ubuntu 22.04.1 LTS (jammy) | 1.5.4+dfsg-0ubuntu0.22.04.1 | clamdscan 1.5.4+dfsg-0ubuntu0.22.04.1 | Aug 7, 2026 |
| clamdscan · Ubuntu 24.04.5 LTS (noble) | 1.5.4+dfsg-0ubuntu0.24.04.1 | clamdscan 1.5.4+dfsg-0ubuntu0.24.04.1 | Aug 7, 2026 |
| clamdscan · Ubuntu 26.04.1 LTS (resolute) | 1.5.4+dfsg-0ubuntu0.26.04.1 | clamdscan 1.5.4+dfsg-0ubuntu0.26.04.1 | Aug 7, 2026 |
| libclamav12 · Ubuntu 22.04.1 LTS (jammy) | 1.5.4+dfsg-0ubuntu0.22.04.1 | libclamav12 1.5.4+dfsg-0ubuntu0.22.04.1 | Aug 7, 2026 |
| libclamav12 · Ubuntu 24.04.5 LTS (noble) | 1.5.4+dfsg-0ubuntu0.24.04.1 | libclamav12 1.5.4+dfsg-0ubuntu0.24.04.1 | Aug 7, 2026 |
| libclamav12 · Ubuntu 26.04.1 LTS (resolute) | 1.5.4+dfsg-0ubuntu0.26.04.1 | libclamav12 1.5.4+dfsg-0ubuntu0.26.04.1 | Aug 7, 2026 |
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