CVE-2026-9064389-ds-base: 389-ds-base: unbounded ldap controls count in get_ldapmessage_controls_ext() causes cpu and heap amplification (remote dos)
Updated under an hour ago ()
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It affects Red Hat Directory Server 11.5 E4S for RHEL 8 and 10 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Modified
- Record last updated
- Aug 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8 redhat:directory_server_e4s | from 8060020260609102432.0ca98e7e not affected | CNA record |
Red Hat Red Hat Directory Server 11.9 for RHEL 8 redhat:directory_server | from 8100020260601104139.37ed7c03 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:3.2.0-7.el10_2 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:3.0.6-18.el10_0 not affected | CNA record |
from 0:1.3.11.1-12.el7_9 not affected | CNA record | |
from 8040020260609102422.96015a92 not affected | CNA record | |
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support redhat:rhel_eus_long_life | from 8040020260609102422.96015a92 not affected | CNA record |
from 8080020260610125847.6dbb3803 not affected | CNA record | |
from 8080020260610125847.6dbb3803 not affected | CNA record | |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:2.6.1-21.el9_6 not affected | CNA record |
Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8 redhat:directory_server_e4s | from 8060020260609102432.0ca98e7e not affected | CISA ADP |
Red Hat Red Hat Directory Server 11.9 for RHEL 8 redhat:directory_server | from 8100020260601104139.37ed7c03 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:3.2.0-7.el10_2 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:3.0.6-18.el10_0 not affected | CISA ADP |
from 0:1.3.11.1-12.el7_9 not affected | CISA ADP | |
from 8040020260609102422.96015a92 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life | from 8040020260609102422.96015a92 not affected | CISA ADP |
from 8080020260610125847.6dbb3803 not affected | CISA ADP | |
from 8080020260610125847.6dbb3803 not affected | CISA ADP | |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:2.6.1-21.el9_6 not affected | CISA ADP |
redhat directory_server redhat:directory_server | 11.0; 12.0; 13.0 | NVD |
redhat 389_directory_server redhat:389_directory_server | all versions | NVD |
redhat enterprise_linux redhat:enterprise_linux | 6.0; 7.0; 8.0; 9.0; 10.0 | NVD |
References
- https://access.redhat.com/errata/RHSA-2026:26452vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26453vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26454vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26455vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26456vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26457vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26458vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26459vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26460vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26461vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26463vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26464vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26465vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26597vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26599vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26639vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:27125vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-9064vdb-entry, x-refsource-redhat, mitigation, vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2480093issue-tracking, x-refsource-redhat, vendor-advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9064.json
The CVE record on cve.org NVD's entry
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