RHSA-2026:26456 - Security Advisory

Topic

An update for 389-ds-base is now available for Red Hat Enterprise Linux 10.

Red Hat Product Security has rated this update as having a security impact of Important. 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: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS) (CVE-2026-9064)

Bug Fix(es) and Enhancement(s):

• DS 12 does not handle escape char in bind user [rhel-10.2.z] (JIRA:RHEL-170271)
• dnaSharedConfig: "dnaPortNum: 0" [rhel-10.2.z] (JIRA:RHEL-170276)
• Memory leaks in syncrepl plugin during persistent search operations [rhel-10.2.z] (JIRA:RHEL-170281)
• access log - suspicious wtime optime negative and large values in internal op [rhel-10.2.z] (JIRA:RHEL-170363)
• An online reinitialization with LMDB is terminating the receiving server [rhel-10.2.z] (JIRA:RHEL-170478)
• dsctl healthcheck DSMOLE0001 inaccurate recommendations when there is more than 1 LDAP backend [rhel-10.2.z] (JIRA:RHEL-170481)
• Possible memory leak when using the Retro Changelog plugin. [rhel-10.2.z] (JIRA:RHEL-170515)
• [RFE] Add OS-level thread names to all server threads [rhel-10.2.z] (JIRA:RHEL-174526)
• Online export is failing when using the option "-s" [rhel-10.2.z] (JIRA:RHEL-180718)
• Server shutdown during online reindex may lead to data loss [rhel-10.2.z] (JIRA:RHEL-183897)
• Error: NssSsl.add_cert() got an unexpected keyword argument 'input_file' [rhel-10.2.z] (JIRA:RHEL-183898)
• Replication errors in logs [rhel-10.2.z] (JIRA:RHEL-183899)
• Substring index produces empty results and can crash when non-default nsSubStrBegin/nsSubStrEnd lengths are configured [rhel-10.2.z] (JIRA:RHEL-183900)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 10 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 10.2 x86_64
• Red Hat Enterprise Linux for IBM z Systems 10 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.2 s390x
• Red Hat Enterprise Linux for Power, little endian 10 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.2 ppc64le
• Red Hat Enterprise Linux for ARM 64 10 aarch64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.2 aarch64
• Red Hat CodeReady Linux Builder for x86_64 10 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 10 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 10 aarch64
• Red Hat CodeReady Linux Builder for IBM z Systems 10 s390x
• Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support 10.2 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support 10.2 ppc64le
• Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support 10.2 s390x
• Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support 10.2 aarch64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.2 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.2 s390x
• Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.2 ppc64le
• Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 10.2 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 10.2 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 10.2 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 10.2 s390x

Fixes

• BZ - 2480093 - CVE-2026-9064 389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)

CVEs

• CVE-2026-9064

References

• https://access.redhat.com/security/updates/classification/#important