Amazon Linux 2023 : openvpn, openvpn-devel (ALAS2023-2026-3226)

high Nessus Plugin ID 371861

Synopsis

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

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-3226 advisory.

When using the OpenSSL library, we escaped embedded null-bytes in a certificate's subject in x509_get_subject(), but in extract_x509_field_ssl(), we copied any null-bytes that are contained in the field value. When using the option --verify-x509-name, this could lead to an incorrect name being accepted. For example, the common name admin\0impersonator would be accepted when running with
--verify-x509-name admin name.

Fixed by: https://github.com/OpenVPN/openvpn/commit/cf4384eef4676a01bd3ee98fa602f7b2af8079ea (v2.7.8) (CVE-2026-84790)

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 openvpn --releasever 2023.12.20261026' or or 'dnf update --advisory ALAS2023-2026-3226 --releasever 2023.12.20261026' to update your system.

Plugin Details

Severity: High

ID: 371861

File Name: al2023_ALAS2023-2026-3226.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 10/25/2026

Updated: 10/25/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.53

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2026-84790

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

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

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

CVSS v4

Risk Factor: High

Base Score: 7.6

Threat Score: 4.9

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:openvpn-debuginfo, p-cpe:/a:amazon:linux:openvpn-debugsource, p-cpe:/a:amazon:linux:openvpn-devel, p-cpe:/a:amazon:linux:openvpn

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/24/2026

Vulnerability Publication Date: 10/13/2026

Reference Information

CVE: CVE-2026-84790

Detections

Analytics