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.
- BDU:2026-12878
- ALSA-2026:26455
- ALSA-2026:26459
- openSUSE-SU-2026:10870-1
- openSUSE-SU-2026:21011-1
- RHSA-2026:26452
- RHSA-2026:26453
- RHSA-2026:26454
- RHSA-2026:26455
- RHSA-2026:26456
- RHSA-2026:26457
- RHSA-2026:26458
- RHSA-2026:26459
- RHSA-2026:26460
- RHSA-2026:26461
- RHSA-2026:26463
- RHSA-2026:26464
- RHSA-2026:26465
- RHSA-2026:26597
- RHSA-2026:26599
- Published
- May 20, 2026
- Updated
- Aug 21, 2026
- EPSS
- 1.1% · 64th percentile
- CWE
- CWE-770
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Report tools
Action score
30
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.1%
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.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| redhat | directory server | cpe:2.3:a:redhat:directory_server |
| redhat | 389 directory server | cpe:2.3:o:redhat:389_directory_server |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_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.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | 389-ds-base | before 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 | 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 |
| AlmaLinux:8 | 389-ds-base-devel | before 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 | 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 |
| AlmaLinux:8 | 389-ds-base-legacy-tools | before 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 | 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 |
| AlmaLinux:8 | 389-ds-base-libs | before 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 | 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 |
| AlmaLinux:8 | 389-ds-base-snmp | before 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 | 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 |
| AlmaLinux:8 | python3-lib389 | before 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 | 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 |
| AlmaLinux:9 | 389-ds-base | before 2.8.0-7.el9_8 | 2.8.0-7.el9_8 |
| AlmaLinux:9 | 389-ds-base-devel | before 2.8.0-7.el9_8 | 2.8.0-7.el9_8 |
| AlmaLinux:9 | 389-ds-base-libs | before 2.8.0-7.el9_8 | 2.8.0-7.el9_8 |
| AlmaLinux:9 | 389-ds-base-snmp | before 2.8.0-7.el9_8 | 2.8.0-7.el9_8 |
| AlmaLinux:9 | python3-lib389 | before 2.8.0-7.el9_8 | 2.8.0-7.el9_8 |
| Debian:12 | 389-ds-base | all versions | — |
| openSUSE:Leap 16.0 | 389-ds | before 3.0.6~git337.647f49042-160000.1.1 | 3.0.6~git337.647f49042-160000.1.1 |
| openSUSE:Tumbleweed | 389-ds | before 3.1.4+e9d94d45a-1.1 | 3.1.4+e9d94d45a-1.1 |
| Red Hat:directory_server_e4s:11.5::el8 | 389-ds-base | before 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 | 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 |
| Red Hat:directory_server_e4s:11.5::el8 | 389-ds-base-debuginfo | before 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 | 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 |
| Red Hat:directory_server_e4s:11.5::el8 | 389-ds-base-debugsource | before 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 | 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 |
| Red Hat:directory_server_e4s:11.5::el8 | 389-ds-base-devel | before 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 | 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 |
| Red Hat:directory_server_e4s:11.5::el8 | 389-ds-base-legacy-tools | before 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 | 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 |
| Red Hat:directory_server_e4s:11.5::el8 | 389-ds-base-legacy-tools-debuginfo | before 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 | 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 |
| Red Hat:directory_server_e4s:11.5::el8 | 389-ds-base-libs | before 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 | 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 |
| Red Hat:directory_server_e4s:11.5::el8 | 389-ds-base-libs-debuginfo | before 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 | 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 |
| Red Hat:directory_server_e4s:11.5::el8 | 389-ds-base-snmp | before 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 | 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 |
| Red Hat:directory_server_e4s:11.5::el8 | 389-ds-base-snmp-debuginfo | before 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 | 0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8 |
+96
Same product
redhat: all recordsOther 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 E40Plan
- 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 deni31Monitor
- CVE-2008-0893Red Hat Administration Server, as used by Red Hat Directory Server 8.0 EL4 and EL5, does not properly restrict access to CGI scripts, which 31Monitor
- CVE-2026-15722389-ds-base: 389-ds-base: pre-authentication stack buffer overflow in get_ruvelement_from_berval() via unbounded replica id parsing30Monitor
- CVE-2026-11770389-ds-base: 389-ds-base: pre-auth ldap filter injection in cleanallruv status check30Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:389-ds-base | 2.8.0-7.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:389-ds-base-devel | 2.8.0-7.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:389-ds-base-legacy-tools | 1.4.3.39-24.module_el8.10.0+4196+be88fbc7 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:389-ds-base-libs | 2.8.0-7.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:389-ds-base-snmp | 2.8.0-7.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:python3-lib389 | 2.8.0-7.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| opensuse:389-ds | 3.1.4+e9d94d45a-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:389-ds-base | 0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstream | Package registry (OSV) |
| red hat:389-ds-base-bdb-debuginfo | 0:3.2.0-7.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:389-ds-base-debuginfo | 0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstream | Package registry (OSV) |
| red hat:389-ds-base-debugsource | 0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstream | Package registry (OSV) |
| red hat:389-ds-base-devel | 0:1.3.11.1-12.el7_9 · Red Hat:rhel_els:7 | Package registry (OSV) |
| red hat:389-ds-base-legacy-tools | 0:1.4.3.35-18.module+el8.8.0+24377+19c5500b · Red Hat:rhel_e4s:8.8::appstream | Package registry (OSV) |
| red hat:389-ds-base-legacy-tools-debuginfo | 0:1.4.3.35-18.module+el8.8.0+24377+19c5500b · Red Hat:rhel_e4s:8.8::appstream | Package registry (OSV) |
| red hat:389-ds-base-libs | 0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstream | Package registry (OSV) |
| red hat:389-ds-base-libs-debuginfo | 0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstream | Package registry (OSV) |
| red hat:389-ds-base-snmp | 0:1.3.11.1-12.el7_9 · Red Hat:rhel_els:7 | Package registry (OSV) |
| red hat:389-ds-base-snmp-debuginfo | 0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstream | Package registry (OSV) |
| red hat:python3-lib389 | 0:2.2.4-18.el9_2 · Red Hat:rhel_e4s:9.2::appstream | Package registry (OSV) |
| rocky linux:389-ds-base | 0:2.8.0-7.el9_8 · Rocky Linux:9 | Package registry (OSV) |
| suse:389-ds | 3.0.6~git337.647f49042-160000.1.1 · SUSE:Linux Enterprise Server 16.0 | Package 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.
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 researchersFinders, 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 ThrottlingCVSS 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.
Attack patterns (CAPEC)
- FloodingCAPEC-125likelihood: High · Medium
- Excessive AllocationCAPEC-130likelihood: Medium · Medium
- XML Ping of the DeathCAPEC-147likelihood: Low · Medium
- Exponential Data ExpansionCAPEC-197likelihood: High · Medium
- Serialized Data Parameter BlowupCAPEC-229likelihood: High · High
- Serialized Data with Nested PayloadsCAPEC-230likelihood: Medium · High
- Oversized Serialized Data PayloadsCAPEC-231likelihood: Medium · High
- HTTP DoSCAPEC-469Low
ATT&CK techniques
- Network Denial of Service:Direct Network FloodT1498.001
- Network Denial of Service:Reflection AmplificationT1498.002
- Endpoint Denial of ServiceT1499
- Endpoint Denial of Service: OS Exhaustion FloodT1499.001
- Endpoint Denial of Service:Service Exhaustion FloodT1499.002
- Endpoint Denial of Service:Application Exhaustion FloodT1499.003
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHSA-2026:26452
- access.redhat.com/errata/RHSA-2026:26453
- access.redhat.com/errata/RHSA-2026:26454
- access.redhat.com/errata/RHSA-2026:26455
- access.redhat.com/errata/RHSA-2026:26456
- access.redhat.com/errata/RHSA-2026:26457
- access.redhat.com/errata/RHSA-2026:26458
- access.redhat.com/errata/RHSA-2026:26459
- access.redhat.com/errata/RHSA-2026:26460
- access.redhat.com/errata/RHSA-2026:26461
- access.redhat.com/errata/RHSA-2026:26463
- access.redhat.com/errata/RHSA-2026:26464
- access.redhat.com/errata/RHSA-2026:26465
- access.redhat.com/errata/RHSA-2026:26597
- access.redhat.com/errata/RHSA-2026:26599
- access.redhat.com/errata/RHSA-2026:26639
- access.redhat.com/errata/RHSA-2026:27125
- access.redhat.com/security/cve/CVE-2026-9064
- bugzilla.redhat.com/show_bug.cgi?id=2480093
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9064.json
Vendor advisories and official records. Exploit/PoC links are deliberately left out.