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Advisory severityHigh7.5Red 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.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-9064 Source published

VulniPulse record published

CVE-2026-9064
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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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 3 months ago·verify at source

Fixed versions
  • RHSA-2026:26463

Official advisory · high-confidence parse· fetched 3 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 3 months ago·verify at source

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