RHSA-2026:64783 — Security Advisory

Red Hat Security Advisory: 389-ds-base security, bug fix, and enhancement update

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Severity

Critical

Red Hat Product Security

RHEL 9

Products

Official CSAF product identity

Published · September 8, 2026

Updated · October 23, 2026

Topic

An update for 389-ds-base is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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-9.6.z] (JIRA:RHEL-244466)
fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation [rhel-9.6.z] (JIRA:RHEL-248765)

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.