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Amazon Linux 2023 : openvpn, openvpn-devel (ALAS2023-2026-1644)

medium Nessus Plugin ID 315626

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Synopsis

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

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1644 advisory.

 According to upstream advisory (https://community.openvpn.net/Security%20Announcements/CVE-2026-35058):

 OpenVPN server crash via ASSERT triggered by malformed tls-crypt-v2 packet; attacker with a valid tls- crypt-v2 client key can send a crafted control channel packet to crash the server (DoS). Fixed in 2.6.20 and 2.7.2. (CVE-2026-35058)

 In a race condition an old TLS session could still try to send a packet but also get replaced by a new session. In this case, the buffer of the new session is still referenced. Add the check_session_buf_not_used function to mitigate this problem. (CVE-2026-40215)

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

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

Solution

Run 'dnf update openvpn --releasever 2023.11.20260511' or or 'dnf update --advisory ALAS2023-2026-1644 --releasever 2023.11.20260511' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1644.html

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

https://explore.alas.aws.amazon.com/CVE-2026-35058.html

https://explore.alas.aws.amazon.com/CVE-2026-40215.html

Plugin Details

Severity: Medium

ID: 315626

File Name: al2023_ALAS2023-2026-1644.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 5/20/2026

Updated: 5/20/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

CVSS Score Source: CVE-2026-40215

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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

Vulnerability Information

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

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/14/2026

Vulnerability Publication Date: 4/22/2026

Reference Information

CVE: CVE-2026-35058, CVE-2026-40215