Amazon Linux 2 : 389-ds-base, --advisory ALAS2-2026-3339 (ALAS-2026-3339)

high Nessus Plugin ID 319836

Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of 389-ds-base installed on the remote host is prior to 1.3.10.2-17. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3339 advisory.

A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service. (CVE-2026-9064)

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 'yum update 389-ds-base' or or 'yum update --advisory ALAS2-2026-3339' to update your system.

Plugin Details

Severity: High

ID: 319836

File Name: al2_ALAS-2026-3339.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 6/8/2026

Updated: 6/8/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-9064

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/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:389-ds-base-debuginfo, p-cpe:/a:amazon:linux:389-ds-base-snmp, p-cpe:/a:amazon:linux:389-ds-base, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:389-ds-base-libs, p-cpe:/a:amazon:linux:389-ds-base-devel

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: 5/20/2026

Reference Information

CVE: CVE-2026-9064

Detections

Analytics