Detections
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Amazon Linux 2023 : tigervnc, tigervnc-icons, tigervnc-license (ALAS2023-2026-1537)

critical Nessus Plugin ID 306204

Synopsis

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

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1537 advisory.

 In TigerVNC before 1.16.2, Image.cxx in x0vncserver allows other users to observe or manipulate the screen contents, or cause an application crash, because of incorrect permissions. (CVE-2026-34352)

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 tigervnc --releasever 2023.11.20260413' or or 'dnf update --advisory ALAS2023-2026-1537 --releasever 2023.11.20260413' to update your system.

See Also

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

https://explore.alas.aws.amazon.com/CVE-2026-34352.html

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1537.html

Plugin Details

Severity: Critical

ID: 306204

File Name: al2023_ALAS2023-2026-1537.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 4/13/2026

Updated: 4/13/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-34352

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:tigervnc, p-cpe:/a:amazon:linux:tigervnc-debuginfo, p-cpe:/a:amazon:linux:tigervnc-server, p-cpe:/a:amazon:linux:tigervnc-server-module, p-cpe:/a:amazon:linux:tigervnc-icons, p-cpe:/a:amazon:linux:tigervnc-license, p-cpe:/a:amazon:linux:tigervnc-server-minimal, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:tigervnc-debugsource, p-cpe:/a:amazon:linux:tigervnc-selinux, p-cpe:/a:amazon:linux:tigervnc-server-debuginfo, p-cpe:/a:amazon:linux:tigervnc-server-minimal-debuginfo, p-cpe:/a:amazon:linux:tigervnc-server-module-debuginfo

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

Exploit Ease: No known exploits are available

Patch Publication Date: 4/13/2026

Vulnerability Publication Date: 3/26/2026

Reference Information

CVE: CVE-2026-34352