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High7.5Red Hat Linux

High [CVE-2026-9064] unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)

This high-severity Red Hat Linux advisory covers CVE-2026-9064 affecting Red Hat Directory Server 11.5 E4S for RHEL 8, Red Hat Directory Server 11.7 E4S for RHEL 8, Red Hat Directory Server 11.9 for RHEL 8.

CVE-2026-9064 Published May 20, 2026
CVE-2026-9064
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS). Red Hat rates this important (CVSS 7.5).

Weakness: CWE-770. Affected package(s): 389-ds-base, 389-ds:1.4, redhat-ds:11, redhat-ds:12, dirsrv/dirsrv-container-rhel10:1781714123.

Resolved in Red Hat advisory RHSA-2026:26463 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Directory Server 11.5 E4S for RHEL 8; Red Hat Directory Server 11.7 E4S for RHEL 8; Red Hat Directory Server 11.9 for RHEL 8; Red Hat Directory Server 12.2 E4S for RHEL 9; and 13 more.

Affected versions
  • 389-ds-base-0:2.8.0-7.el9_8
  • 389-ds:1.4-8100020260601102239.25e700aa
  • redhat-ds:11-8080020260610130252.f969626e
  • 389-ds-base-0:2.6.1-21.el9_6
  • redhat-ds:12-9040020260611130021.1674d574
  • redhat-ds:11-8060020260609102432.0ca98e7e
  • redhat-ds:12-9020020260615123354.1674d574
  • 389-ds-base-0:2.2.4-18.el9_2
  • 389-ds-base-0:3.0.6-18.el10_0
  • 389-ds:1.4-8060020260609102416.824efc52
  • 389-ds-base-0:1.3.11.1-12.el7_9
  • redhat-ds:11-8100020260601104139.37ed7c03

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • RHSA-2026:26463

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Update the affected package(s) to the fixed version shipped in RHSA-2026:26463 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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