Amazon Linux 2 : 389-ds-base, --advisory ALAS2-2026-3853 (ALAS-2026-3853)

high Nessus Plugin ID 331982

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 ALAS2-2026-3853 advisory.

A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server(389-ds-base). After a successful SASL bind with integrity protection (SSF > 0),an authenticated attacker can send a specially crafted oversized LDAP UNBIND packetthat is copied into a 512-byte heap receive buffer without a bounds check insasl_io_recv() in sasl_io.c. This allows up to approximately 2 megabytes ofattacker-controlled data to overflow the buffer, causing a denial of service (servercrash). In FreeIPA and Red Hat Identity Management deployments, any domain user witha valid Kerberos ticket, any enrolled host, or any service account can trigger thisvulnerability over the network after authenticating via GSSAPI.The vulnerable code path has existed since approximately 2013 (389-ds-base 1.3.2) andwas not addressed by the CVE-2025-14905 fix, which patched a separate heap overflowin schema.c only. (CVE-2026-11610)

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 ALAS2-2026-3853' to update your system.

Plugin Details

Severity: High

ID: 331982

File Name: al2_ALAS-2026-3853.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 8/4/2026

Updated: 8/4/2026

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: 6.9

Percentile: 96.92

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-11610

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:389-ds-base-debuginfo, p-cpe:/a:amazon:linux:389-ds-base-devel, p-cpe:/a:amazon:linux:389-ds-base-libs, p-cpe:/a:amazon:linux:389-ds-base-snmp, p-cpe:/a:amazon:linux:389-ds-base

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/4/2026

Vulnerability Publication Date: 7/2/2026

Reference Information

CVE: CVE-2026-11610

Detections

Analytics