Amazon Linux 2023 : gnutls, gnutls-c++, gnutls-dane (ALAS2023-2026-1808)

high Nessus Plugin ID 319831

Synopsis

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

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1808 advisory.

Permitted name constraints were wrongfully ignored when prior CAs only had excluded name constraints, resulting in a name constraint bypass. The issue was reported in the issue tracker as #1824 by Haruto Kimura (Stella). (CVE-2026-42011)

Certificates containing URI or SRV Subject Alternative Names would fall back to checking DNS hostnames against Common Name, allowing potential misuse of such certificates beyond their original purpose. The issue was reported in the issue tracker as #1802 by Oleh Konko (1seal). (CVE-2026-42012)

Validation of certificates with oversized Subject Alternative Names would fall back to checking DNS hostnames against Common Name. (CVE-2026-42013)

The PKCS#7 padding check performed during decryption was not constant-time, potentially leaking information about the padding bytes through timing differences. The issue was reported in the issue tracker as #1815 by Doria Tang of Stony Brook University.Recommendation: To address the issue found, upgrade to GnuTLS 3.8.13 or later versions. (CVE-2026-5419)

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 gnutls --releasever 2023.12.20260608' or or 'dnf update --advisory ALAS2023-2026-1808 --releasever 2023.12.20260608' to update your system.

Plugin Details

Severity: High

ID: 319831

File Name: al2023_ALAS2023-2026-1808.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 6/8/2026

Updated: 6/8/2026

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: High

Base Score: 8.5

Temporal Score: 6.3

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

CVSS Score Source: CVE-2026-42013

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:gnutls-c%2b%2b-debuginfo, p-cpe:/a:amazon:linux:gnutls-debuginfo, p-cpe:/a:amazon:linux:gnutls-debugsource, p-cpe:/a:amazon:linux:gnutls-utils, p-cpe:/a:amazon:linux:gnutls-utils-debuginfo, p-cpe:/a:amazon:linux:gnutls-dane-debuginfo, p-cpe:/a:amazon:linux:gnutls-devel, p-cpe:/a:amazon:linux:gnutls-dane, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:gnutls, p-cpe:/a:amazon:linux:gnutls-c%2b%2b

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/8/2026

Vulnerability Publication Date: 4/30/2026

Reference Information

CVE: CVE-2026-42011, CVE-2026-42012, CVE-2026-42013, CVE-2026-5419

IAVA: 2026-A-0405

Detections

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