RHEL 8 : 389-ds:1.4 (RHSA-2026:64791)

critical Nessus Plugin ID 343771

Synopsis

The remote Red Hat host is missing one or more security updates.

Description

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:64791 advisory.

389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.

Security Fix(es):

* 389-ds-base: 389-ds-base: heap buffer overflow via SASL wrapped-record length lower-bound underflow in sasl_io_start_packet() (CVE-2026-18355)

* 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and USE_ONE_BACKEND control in op_shared_search (CVE-2026-18453)

* 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via stale identity in Cyrus SASL auxiliary property (CVE-2026-18922)

* 389-ds-base: 389-ds: anonymous LDAP client can defeat SELFDN ACI bind-rule checks via empty bind DN (CVE-2026-76560)

Bug Fix(es) and Enhancement(s):

* lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [rhel-8.10.z] (JIRA:RHEL-244463)

* fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation [rhel-8.10.z] (JIRA:RHEL-248762)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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

Update the affected packages.

Plugin Details

Severity: Critical

ID: 343771

File Name: redhat-RHSA-2026-64791.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 9/8/2026

Updated: 9/8/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.23

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-18922

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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:redhat:enterprise_linux:8, cpe:/o:redhat:rhel_eus:8.10, p-cpe:/a:redhat:enterprise_linux:389-ds-base-devel, p-cpe:/a:redhat:enterprise_linux:389-ds-base-legacy-tools, p-cpe:/a:redhat:enterprise_linux:389-ds-base-libs, p-cpe:/a:redhat:enterprise_linux:389-ds-base-snmp, p-cpe:/a:redhat:enterprise_linux:389-ds-base, p-cpe:/a:redhat:enterprise_linux:python3-lib389

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 9/7/2026

Reference Information

CVE: CVE-2026-18355, CVE-2026-18453, CVE-2026-18922, CVE-2026-76560

CWE: 191, 287, 476, 863

RHSA: 2026:64791

Detections

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