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ALSA-2026:64784 — Critical: 389-ds-base security, bug fix, and enhancement update

Affected: AlmaLinux:9: 389-ds-base, AlmaLinux:9: 389-ds-base-devel, AlmaLinux:9: 389-ds-base-libs, AlmaLinux:9: 389-ds-base-snmp, AlmaLinux:9: python3-lib389

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) * 389-ds-base: 389-ds-base: CVE-2026-11610 incomplete fix may introduce a connection-stall DoS (CVE-2026-78701)

Bug Fix(es) and Enhancement(s):

* lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [almalinux-9.8.z] (JIRA:AlmaLinux-244467) * fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation [almalinux-9.8.z] (JIRA:AlmaLinux-248766)

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.

fkie_cve-2026-18453

A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.

GHSA-42wr-8m7m-5j62

RHSA-2026:64771 — Red Hat Security Advisory: 389-ds-base security, bug fix, and enhancement update

389-ds-base: 389-ds-base: heap buffer overflow via SASL wrapped-record length lower-bound underflow in sasl_io_start_packet() 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and USE_ONE_BACKEND control in op_shared_search 389-ds-base: 389-ds-base: SASL PLAIN authentication allows privilege escalation to Directory Manager via stale identity in Cyrus SASL auxiliary property 389-ds-base: 389-ds: anonymous LDAP client can defeat SELFDN ACI bind-rule checks via empty bind DN

RHSA-2026:64783 — Red Hat Security Advisory: 389-ds-base security, bug fix, and enhancement update

RLSA-2026:64784 — Critical: 389-ds-base security, bug fix, and enhancement update

Affected: Rocky Linux:9: 389-ds-base

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)

* 389-ds-base: 389-ds-base: CVE-2026-11610 incomplete fix may introduce a connection-stall DoS (CVE-2026-78701)

Bug Fix(es) and Enhancement(s):

* lib389: set nsDS5ReplicaBindDNGroup before ensure_agreement() [rhel-9.8.z] (JIRA:Rocky Linux-244467)

* fix breaks replication total init when nsDS5ReplicaBindDNGroup is set after agreement creation [rhel-9.8.z] (JIRA:Rocky Linux-248766)

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.

UBUNTU-CVE-2026-18453

Affected: Ubuntu:Pro:16.04:LTS: 389-ds-base, Ubuntu:Pro:18.04:LTS: 389-ds-base, Ubuntu:Pro:20.04:LTS: 389-ds-base, Ubuntu:22.04:LTS: 389-ds-base, Ubuntu:24.04:LTS: 389-ds-base, Ubuntu:26.04:LTS: 389-ds-base

WID-SEC-W-2026-3215 — Red Hat Directory Server und Enterprise Linux (389-ds-base): Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Red Hat Directory Server und Red Hat Enterprise Linux ausnutzen, um beliebigen Code auszuführen, Administratorrechte zu erlangen, Daten zu manipulieren oder einen Denial-of-Service-Zustand auszulösen.