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7.5 High

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)

Description

A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.

CVSS 3.1 detail

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
Low
Privileges required
None
Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Affected products and versions

Product Affected versions Fixed in
Red Hat Directory Server 11 Versions not published
Red Hat Directory Server 12 Versions not published
Red Hat Directory Server 13 Versions not published
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 6 Versions not published
Red Hat Enterprise Linux 7 Versions not published
Red Hat Enterprise Linux 8 8100020260601102239.25 earliest → < 8100020260601102239.25e700aa 8100020260601102239.25e700aa
Red Hat Enterprise Linux 9 Versions not published
Red Hat Directory Server 11.9 for RHEL 8 8100020260601104139.37 earliest → < 8100020260601104139.37ed7c03 8100020260601104139.37ed7c03
Show the 35 other branches
Product Affected versions Fixed in
Red Hat Directory Server 11.5 E4S for RHEL 8 8060020260609102432.0 earliest → < 8060020260609102432.0ca98e7e 8060020260609102432.0ca98e7e
Red Hat Enterprise Linux 10.0 Extended Update Support Versions not published
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020260609102416.824 earliest → < 8060020260609102416.824efc52 8060020260609102416.824efc52
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 8060020260609102416.824 earliest → < 8060020260609102416.824efc52 8060020260609102416.824efc52
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 7 Extended Lifecycle Support Versions not published
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020260609102422.96015 earliest → < 8040020260609102422.96015a92 8040020260609102422.96015a92
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 8040020260609102422.96015 earliest → < 8040020260609102422.96015a92 8040020260609102422.96015a92
Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020260610125847.6 earliest → < 8080020260610125847.6dbb3803 8080020260610125847.6dbb3803
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020260610125847.6 earliest → < 8080020260610125847.6dbb3803 8080020260610125847.6dbb3803
Red Hat Enterprise Linux 9.6 Extended Update Support Versions not published
Red Hat Directory Server 12.2 E4S for RHEL 9 9020020260615123354.1674 earliest → < 9020020260615123354.1674d574 9020020260615123354.1674d574
Red Hat Directory Server 11.7 E4S for RHEL 8 8080020260610130252 earliest → < 8080020260610130252.f969626e 8080020260610130252.f969626e
Red Hat Directory Server 12.4 E4S for RHEL 9 9040020260611130021.1674 earliest → < 9040020260611130021.1674d574 9040020260611130021.1674d574
Red Hat Directory Server 13.2 1781714123 earliest → < 1781714123 1781714123
Red Hat Enterprise Linux Server (v. 7 ELS) Versions not published
Red Hat Enterprise Linux Server Optional (v. 7 ELS) Versions not published
Red Hat Enterprise Linux AppStream EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux AppStream (v. 10) Versions not published
Red Hat Enterprise Linux AppStream (v. 8) Versions not published
Red Hat Enterprise Linux AppStream AUS (v.8.4) Versions not published
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) Versions not published
Red Hat Enterprise Linux AppStream AUS (v.8.6) Versions not published
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) Versions not published
Red Hat Enterprise Linux AppStream E4S (v.8.8) Versions not published
Red Hat Enterprise Linux AppStream TUS (v.8.8) Versions not published
Red Hat Enterprise Linux AppStream E4S (v.9.2) Versions not published
Red Hat Enterprise Linux AppStream E4S (v.9.4) Versions not published
Red Hat Enterprise Linux AppStream EUS (v.9.6) Versions not published
Red Hat Enterprise Linux AppStream (v. 9) Versions not published
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) Versions not published
Red Hat CodeReady Linux Builder EUS (v.9.6) Versions not published
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) Versions not published

References

Timeline

  1. Published
  2. Last modified

Other CVEs of Red Hat Directory Server 11

The 42 CVEs of Red Hat Directory Server 11 →
CVE-2026-117548 389-ds-base: 389-ds-base: null pointer dereference via modifydn using an attribute's schema alias name causes denial of service 6.5 Medium CVE-2026-86345 389-ds-base: 389-ds-base: starttls plaintext-buffer retention allows on-path attacker to forge an ldap client's authentication result 9.0 Critical CVE-2026-86344 389-ds-base: 389-ds-base: unauthenticated worker-thread-pool exhaustion via completed-operation-then-incomplete-pdu connection requeue 7.5 High CVE-2026-19843 389-ds-base: 389-ds-base: command injection via unescaped ldap dn in cockpit 389 console ldap editor 8.4 High
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