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NVD / CVE Program· CNA redhat

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)

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.81% (FIRST EPSS); higher than 56.8% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: 389-ds-base (AlmaLinux:8) 1.4.3.39-24.module_el8.10.0+4196+be88fbc7; 389-ds-base-devel (AlmaLinux:8) 1.4.3.39-24.module_el8.10.0+4196+be88fbc7; 389-ds-base-legacy-tools (AlmaLinux:8) 1.4.3.39-24.module_el8.10.0+4196+be88fbc7.

Low priority for now. Upgrade to 389-ds-base (AlmaLinux:8) 1.4.3.39-24.module_el8.10.0+4196+be88fbc7; 389-ds-base-devel (AlmaLinux:8) 1.4.3.39-24.module_el8.10.0+4196+be88fbc7; 389-ds-base-legacy-tools (AlmaLinux:8) 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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 7.5 · v3.1—No exploit Fix available
Published
May 20, 2026
Updated
Aug 21, 2026
EPSS
0.8% · 56th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
redhatdirectory server
redhat389 directory server
redhatenterprise linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • redhat 389 directory serverall versions
  • redhat directory server11.0
  • redhat directory server12.0
  • redhat directory server13.0
  • redhat enterprise linux10.0
  • redhat enterprise linux6.0
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • github.com/389ds/389-ds-base 389-ds-base

    • 0affected

  • Red Hat Red Hat Directory Server 11.5 E4S for RHEL 8

    • 8060020260609102432.0ca98e7e and laternot affected · rpm

  • Red Hat Red Hat Directory Server 11.7 E4S for RHEL 8

    • 8080020260610130252.f969626e and laternot affected · rpm

  • Red Hat Red Hat Directory Server 11.9 for RHEL 8

    • 8100020260601104139.37ed7c03 and laternot affected · rpm

  • Red Hat Red Hat Directory Server 12

    • all versionsaffected

  • Red Hat Red Hat Directory Server 12.2 E4S for RHEL 9

    • 9020020260615123354.1674d574 and laternot affected · rpm

  • Red Hat Red Hat Directory Server 12.4 E4S for RHEL 9

    • 9040020260611130021.1674d574 and laternot affected · rpm

  • Red Hat Red Hat Directory Server 13

    • all versionsaffected

  • Red Hat Red Hat Directory Server 13.2

    • 1781714123 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10

    • 0:3.2.0-7.el10_2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support

    • 0:3.0.6-18.el10_0 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8389-ds-basebefore 1.4.3.39-24.module_el8.10.0+4196+be88fbc71.4.3.39-24.module_el8.10.0+4196+be88fbc7
AlmaLinux:8389-ds-base-develbefore 1.4.3.39-24.module_el8.10.0+4196+be88fbc71.4.3.39-24.module_el8.10.0+4196+be88fbc7
AlmaLinux:8389-ds-base-legacy-toolsbefore 1.4.3.39-24.module_el8.10.0+4196+be88fbc71.4.3.39-24.module_el8.10.0+4196+be88fbc7
AlmaLinux:8389-ds-base-libsbefore 1.4.3.39-24.module_el8.10.0+4196+be88fbc71.4.3.39-24.module_el8.10.0+4196+be88fbc7
AlmaLinux:8389-ds-base-snmpbefore 1.4.3.39-24.module_el8.10.0+4196+be88fbc71.4.3.39-24.module_el8.10.0+4196+be88fbc7
AlmaLinux:8python3-lib389before 1.4.3.39-24.module_el8.10.0+4196+be88fbc71.4.3.39-24.module_el8.10.0+4196+be88fbc7
AlmaLinux:9389-ds-basebefore 2.8.0-7.el9_82.8.0-7.el9_8
AlmaLinux:9389-ds-base-develbefore 2.8.0-7.el9_82.8.0-7.el9_8
AlmaLinux:9389-ds-base-libsbefore 2.8.0-7.el9_82.8.0-7.el9_8
AlmaLinux:9389-ds-base-snmpbefore 2.8.0-7.el9_82.8.0-7.el9_8
AlmaLinux:9python3-lib389before 2.8.0-7.el9_82.8.0-7.el9_8
Debian:12389-ds-basefrom 0—
openSUSE:Tumbleweed389-dsbefore 3.1.4+e9d94d45a-1.13.1.4+e9d94d45a-1.1
Red Hat:directory_server_e4s:11.5::el8389-ds-basebefore 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d80:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8
Red Hat:directory_server_e4s:11.5::el8389-ds-base-debuginfobefore 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d80:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8
Red Hat:directory_server_e4s:11.5::el8389-ds-base-debugsourcebefore 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d80:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8
Red Hat:directory_server_e4s:11.5::el8389-ds-base-develbefore 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d80:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8
Red Hat:directory_server_e4s:11.5::el8389-ds-base-legacy-toolsbefore 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d80:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8
Red Hat:directory_server_e4s:11.5::el8389-ds-base-legacy-tools-debuginfobefore 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d80:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8
Red Hat:directory_server_e4s:11.5::el8389-ds-base-libsbefore 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d80:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8
Red Hat:directory_server_e4s:11.5::el8389-ds-base-libs-debuginfobefore 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d80:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8
Red Hat:directory_server_e4s:11.5::el8389-ds-base-snmpbefore 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d80:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8
Red Hat:directory_server_e4s:11.5::el8389-ds-base-snmp-debuginfobefore 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d80:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8
Red Hat:directory_server_e4s:11.5::el8cockpit-389-dsbefore 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d80:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8

+96

Same product

redhat: all records

Other highest-scoring records for the same primary product.

  • CVE-2008-2928Multiple buffer overflows in the adminutil library in CGI applications in Red Hat Directory Server 7.1 before SP7 allow remote attackers to
    42Plan
  • CVE-2008-0892The replication monitor CGI script (repl-monitor-cgi.pl) in Red Hat Administration Server, as used by Red Hat Directory Server 8.0 EL4 and E
    40Plan
  • CVE-2008-1677Buffer overflow in the regular expression handler in Red Hat Directory Server 8.0 and 7.1 before SP6 allows remote attackers to cause a deni
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2023-1055Feb 27, 2023 · A flaw was found in RHDS 11 and RHDS 12.
    22Monitor
  • ← EarlierCVE-2024-6237Jul 9, 2024 · 389-ds-base: unauthenticated user can trigger a dos by sending a specific extended search request
    26Monitor
  • Later →CVE-2026-11611Jun 8, 2026 · 389-ds-base: 389-ds-base: content sync plugin unbounded queue growth and race conditions
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:389-ds-base2.8.0-7.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:389-ds-base-devel2.8.0-7.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:389-ds-base-legacy-tools1.4.3.39-24.module_el8.10.0+4196+be88fbc7 · AlmaLinux:8Package registry (OSV)
almalinux:389-ds-base-libs2.8.0-7.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:389-ds-base-snmp2.8.0-7.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3-lib3892.8.0-7.el9_8 · AlmaLinux:9Package registry (OSV)
opensuse:389-ds3.1.4+e9d94d45a-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:389-ds-base0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
red hat:389-ds-base-bdb-debuginfo0:3.2.0-7.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:389-ds-base-debuginfo0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
red hat:389-ds-base-debugsource0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
red hat:389-ds-base-devel0:1.3.11.1-12.el7_9 · Red Hat:rhel_els:7Package registry (OSV)
red hat:389-ds-base-legacy-tools0:1.4.3.35-18.module+el8.8.0+24377+19c5500b · Red Hat:rhel_e4s:8.8::appstreamPackage registry (OSV)
red hat:389-ds-base-legacy-tools-debuginfo0:1.4.3.35-18.module+el8.8.0+24377+19c5500b · Red Hat:rhel_e4s:8.8::appstreamPackage registry (OSV)
red hat:389-ds-base-libs0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
red hat:389-ds-base-libs-debuginfo0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
red hat:389-ds-base-snmp0:1.3.11.1-12.el7_9 · Red Hat:rhel_els:7Package registry (OSV)
red hat:389-ds-base-snmp-debuginfo0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
red hat:python3-lib3890:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstreamPackage registry (OSV)
rocky linux:389-ds-base0:2.8.0-7.el9_8 · Rocky Linux:9Package registry (OSV)
suse:389-ds2.0.20~git90.9f70d434e-150400.3.51.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:389-ds3.0.6~git337.647f49042-160000.1.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-770 · Allocation of Resources Without Limits or Throttling

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records