Vulnerability Intelligence Report
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
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.
No Active Exploit Signals
CVSS Base Score
7.5
HIGH
Exploitability:3.9
Impact Score:3.6
EPSS Probability:0.81%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
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Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-770 ↗Allocation of Resources Without Limits or Throttling
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| 0 (affected) | ||
| Red Hat | Red Hat Directory Server 11.5 E4S for RHEL 8 | 8060020260609102432.0ca98e7e < * (unaffected) |
| Red Hat | Red Hat Directory Server 11.7 E4S for RHEL 8 | 8080020260610130252.f969626e < * (unaffected) |
| Red Hat | Red Hat Directory Server 11.9 for RHEL 8 | 8100020260601104139.37ed7c03 < * (unaffected) |
| Red Hat | Red Hat Directory Server 12.2 E4S for RHEL 9 | 9020020260615123354.1674d574 < * (unaffected) |
| Red Hat | Red Hat Directory Server 12.4 E4S for RHEL 9 | 9040020260611130021.1674d574 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 10 | 0:3.2.0-7.el10_2 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | 0:3.0.6-18.el10_0 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | 0:1.3.11.1-12.el7_9 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8 | 8100020260601102239.25e700aa < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | 8040020260609102422.96015a92 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | 8040020260609102422.96015a92 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | 8060020260609102416.824efc52 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | 8060020260609102416.824efc52 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | 8080020260610125847.6dbb3803 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | 8080020260610125847.6dbb3803 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 9 | 0:2.8.0-7.el9_8 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | 0:2.2.4-18.el9_2 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | 0:2.4.5-25.el9_4 < * (unaffected) |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | 0:2.6.1-21.el9_6 < * (unaffected) |
| Red Hat | Red Hat Directory Server 13.2 | 1781714123 < * (unaffected) |
| Red Hat | Red Hat Directory Server 12 | all |
| Red Hat | Red Hat Directory Server 13 | all |
| Red Hat | Red Hat Enterprise Linux 6 | all |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.815%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Red Hat, Inc. · Vendor · USA |
| Reserved | 2026-05-20T08:19:21 |
| Published | 2026-05-20T09:00:42 |
| Patch Date | 2026-05-20 |
| Last Updated | 2026-08-21T12:13:00 |
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