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Amazon Linux 2023 : clamav1.4, clamav1.4-data, clamav1.4-devel (ALAS2023-2026-1630)

medium Nessus Plugin ID 311310

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1630 advisory.

 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)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Run 'dnf update clamav1.4 --releasever 2023.11.20260427' or or 'dnf update --advisory ALAS2023-2026-1630 --releasever 2023.11.20260427' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1630.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-20031.html

Plugin Details

Severity: Medium

ID: 311310

File Name: al2023_ALAS2023-2026-1630.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 4/30/2026

Updated: 4/30/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-20031

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:clamav1.4-filesystem, p-cpe:/a:amazon:linux:clamav1.4, p-cpe:/a:amazon:linux:clamav1.4-freshclam-debuginfo, p-cpe:/a:amazon:linux:clamav1.4-debugsource, p-cpe:/a:amazon:linux:clamav1.4-lib, p-cpe:/a:amazon:linux:clamav1.4-milter-debuginfo, p-cpe:/a:amazon:linux:clamd1.4, p-cpe:/a:amazon:linux:clamav1.4-doc, p-cpe:/a:amazon:linux:clamav1.4-milter, p-cpe:/a:amazon:linux:clamav1.4-devel, p-cpe:/a:amazon:linux:clamd1.4-debuginfo, p-cpe:/a:amazon:linux:clamav1.4-lib-debuginfo, p-cpe:/a:amazon:linux:clamav1.4-freshclam, p-cpe:/a:amazon:linux:clamav1.4-data, p-cpe:/a:amazon:linux:clamav1.4-debuginfo, cpe:/o:amazon:linux:2023

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 4/30/2026

Vulnerability Publication Date: 3/4/2026

Reference Information

CVE: CVE-2026-20031

IAVA: 2026-A-0209