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CVE Record

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)

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.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-9064 is a denial-of-service flaw in Red Hat 389 Directory Server components. A remote unauthenticated client can send an LDAP message with an excessive number of controls, consuming CPU and memory. The business risk is directory service slowdown or outage, which can disrupt authentication-dependent applications.

Executive priority

Treat as high priority for any exposed directory service because authentication infrastructure availability can affect many business systems. Prioritize internet-facing or broadly reachable LDAP servers first.

Technical view

The flaw is in get_ldapmessage_controls_ext(), which lacks an upper bound on LDAP controls per message. Within the default 2 MB BER message size, many minimal controls can cause CPU and heap amplification. Concurrent requests may cause latency degradation, worker thread starvation, or out-of-memory termination.

Likely exposure

Organizations running affected Red Hat Directory Server, 389-ds-base, or redhat-ds packages on listed RHEL 7 ELS, 8, 9, 10, and related EUS/E4S streams are potentially exposed, especially where LDAP services are reachable from untrusted networks.

Exploitation context

The source states remote unauthenticated exploitation is possible for denial of service. KEV is false, and the provided bundle does not cite active exploitation in the wild or public exploit tooling.

Researcher notes

The core issue is unbounded control parsing in LDAP message handling, classified as CWE-770. Evidence supports availability impact only; the bundle does not indicate confidentiality or integrity compromise.

Mitigation direction

  • Identify affected Red Hat Directory Server and 389-ds-base deployments.
  • Apply the relevant Red Hat RHSA updates for the product stream.
  • If updates are unavailable, check Red Hat guidance for supported mitigations.
  • Restrict LDAP reachability to trusted networks where operationally feasible.
  • Monitor directory service CPU, memory, latency, and process restarts.

Validation and detection

  • Inventory installed 389-ds-base, redhat-ds, and Directory Server versions.
  • Compare deployed versions against the affected products and versions listed in the CVE bundle.
  • Review applicable RHSA advisories for fixed package guidance.
  • Check LDAP service logs for abnormal request volume or resource exhaustion symptoms.
  • Confirm post-update package versions match vendor advisory expectations.
Prepared
Confidence
high
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-770: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-9064 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
2ADP providers
21Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhat
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-9064Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. ADP timelineredhat-SADP

    Reported to Red Hat.

  2. Source timelineredhat

    Reported to Red Hat.

  3. ADP timelineredhat-SADP

    Made public.

  4. Source timelineredhat

    Made public.

  5. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  6. CVE publishedCVE Program

    The CVE record was published.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADP389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)
other:Red Hat severity ratingcvssV3_1
  • 2026-03-05T00:00:00.000Z: Reported to Red Hat.
  • 2026-05-20T07:30:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat Directory Server 11.5 E4S for RHEL 8redhat-ds:11, 8060020260609102432.0ca98e7eaffected
Red HatRed Hat Directory Server 11.7 E4S for RHEL 8redhat-ds:11, 8080020260610130252.f969626eaffected
Red HatRed Hat Directory Server 11.9 for RHEL 8redhat-ds:11, 8100020260601104139.37ed7c03affected
Red HatRed Hat Directory Server 12.2 E4S for RHEL 9redhat-ds:12, 9020020260615123354.1674d574affected
Red HatRed Hat Directory Server 12.4 E4S for RHEL 9redhat-ds:12, 9040020260611130021.1674d574affected
Red HatRed Hat Enterprise Linux 10389-ds-base, 0:3.2.0-7.el10_2affected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support389-ds-base, 0:3.0.6-18.el10_0affected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support389-ds-base, 0:1.3.11.1-12.el7_9affected
Red HatRed Hat Enterprise Linux 8389-ds:1.4, 8100020260601102239.25e700aaaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support389-ds:1.4, 8040020260609102422.96015a92affected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On389-ds:1.4, 8040020260609102422.96015a92affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support389-ds:1.4, 8060020260609102416.824efc52affected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On389-ds:1.4, 8060020260609102416.824efc52affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service389-ds:1.4, 8080020260610125847.6dbb3803affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions389-ds:1.4, 8080020260610125847.6dbb3803affected
Red HatRed Hat Enterprise Linux 9389-ds-base, 0:2.8.0-7.el9_8affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions389-ds-base, 0:2.2.4-18.el9_2affected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions389-ds-base, 0:2.4.5-25.el9_4affected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support389-ds-base, 0:2.6.1-21.el9_6affected
Red HatRed Hat Directory Server 13.2dirsrv/dirsrv-container-rhel10, 1781714123affected
Red HatRed Hat Directory Server 12redhat-ds:12/389-ds-baseaffected
Red HatRed Hat Directory Server 13389-ds-baseaffected
Red HatRed Hat Enterprise Linux 6389-ds-baseunknown
Weakness

CWE details

CWE-770

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-770 · source CWE mapping

Allocation of Resources Without Limits or Throttling

Allocation of Resources Without Limits or Throttling represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs