CVE-2026-9064

HIGH 7.5

389-ds-base: 389-ds-base: unbounded ldap controls count in get_ldapmessage_controls_ext() causes cpu and heap amplification (remote dos)

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-770
Vendor	red hat
Product	red hat directory server 11.5 e4s for rhel 8
Published	May 20, 2026
Last Updated	Jun 30, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

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

All versions affected

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

All versions affected

Red Hat / Red Hat Directory Server 11.9 for RHEL 8

All versions affected

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

All versions affected

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

All versions affected

Red Hat / Red Hat Enterprise Linux 10

All versions affected

Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support

All versions affected

Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support

All versions affected

Red Hat / Red Hat Enterprise Linux 8

All versions affected

Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

All versions affected

Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

All versions affected

Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

All versions affected

Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

All versions affected

Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service

All versions affected

Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

All versions affected

Red Hat / Red Hat Enterprise Linux 9

All versions affected

Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

All versions affected

Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

All versions affected

Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support

All versions affected

Red Hat / Red Hat Directory Server 13.2

All versions affected

Red Hat / Red Hat Directory Server 12

All versions affected

Red Hat / Red Hat Directory Server 13

All versions affected

Red Hat / Red Hat Enterprise Linux 6

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

Credits

Red Hat would like to thank Oleh Konko (1seal.org) for reporting this issue.