Amazon Linux 2023 Security Advisory: ALAS2023-2026-1631
Advisory Released Date: 2026-04-30
Advisory Updated Date: 2026-04-30
Severity:
Medium
Issue Overview:
A vulnerability in the HTML Cascading Style Sheets (CSS) module of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to improper error handling when splitting UTF-8 strings. An attacker could exploit this vulnerability by submitting a crafted HTML file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the scanning process. (CVE-2026-20031)
Affected Packages:
clamav1.5
Issue Correction:
Run dnf update clamav1.5 --releasever 2023.11.20260427 or dnf update --advisory ALAS2023-2026-1631 --releasever 2023.11.20260427 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
New Packages:
aarch64:
clamd1.5-debuginfo-1.5.2-1.amzn2023.0.1.aarch64
clamav1.5-devel-1.5.2-1.amzn2023.0.1.aarch64
clamav1.5-debuginfo-1.5.2-1.amzn2023.0.1.aarch64
clamav1.5-milter-debuginfo-1.5.2-1.amzn2023.0.1.aarch64
clamav1.5-lib-debuginfo-1.5.2-1.amzn2023.0.1.aarch64
clamav1.5-freshclam-debuginfo-1.5.2-1.amzn2023.0.1.aarch64
clamd1.5-1.5.2-1.amzn2023.0.1.aarch64
clamav1.5-1.5.2-1.amzn2023.0.1.aarch64
clamav1.5-milter-1.5.2-1.amzn2023.0.1.aarch64
clamav1.5-freshclam-1.5.2-1.amzn2023.0.1.aarch64
clamav1.5-lib-1.5.2-1.amzn2023.0.1.aarch64
clamav1.5-debugsource-1.5.2-1.amzn2023.0.1.aarch64
noarch:
clamav1.5-data-1.5.2-1.amzn2023.0.1.noarch
clamav1.5-filesystem-1.5.2-1.amzn2023.0.1.noarch
clamav1.5-doc-1.5.2-1.amzn2023.0.1.noarch
src:
clamav1.5-1.5.2-1.amzn2023.0.1.src
x86_64:
clamav1.5-debuginfo-1.5.2-1.amzn2023.0.1.x86_64
clamd1.5-1.5.2-1.amzn2023.0.1.x86_64
clamav1.5-freshclam-debuginfo-1.5.2-1.amzn2023.0.1.x86_64
clamd1.5-debuginfo-1.5.2-1.amzn2023.0.1.x86_64
clamav1.5-1.5.2-1.amzn2023.0.1.x86_64
clamav1.5-devel-1.5.2-1.amzn2023.0.1.x86_64
clamav1.5-milter-debuginfo-1.5.2-1.amzn2023.0.1.x86_64
clamav1.5-lib-debuginfo-1.5.2-1.amzn2023.0.1.x86_64
clamav1.5-milter-1.5.2-1.amzn2023.0.1.x86_64
clamav1.5-freshclam-1.5.2-1.amzn2023.0.1.x86_64
clamav1.5-lib-1.5.2-1.amzn2023.0.1.x86_64
clamav1.5-debugsource-1.5.2-1.amzn2023.0.1.x86_64