What is CVE-2026-9064?

CVE-2026-9064 is a high-severity vulnerability in Red Hat Directory Server 11, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-05-20.

How severe is CVE-2026-9064?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Red Hat Directory Server 11

CVE-2026-9064

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 LDA…

EPSS: 0.008 (53.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Red Hat Directory Server 11
Red Hat Directory Server 11.5 E4s For Rhel 8 — versions 8060020260609102432.0ca98e7e
Red Hat Directory Server 11.7 E4s For Rhel 8 — versions 8080020260610130252.f969626e
Red Hat Directory Server 11.9 For Rhel 8 — versions 8100020260601104139.37ed7c03
Red Hat Directory Server 12
Red Hat Directory Server 12.2 E4s For Rhel 9 — versions 9020020260615123354.1674d574
Red Hat Directory Server 12.4 E4s For Rhel 9 — versions 9040020260611130021.1674d574
Red Hat Directory Server 13
Red Hat Directory Server 13.2 — versions 1781714123
Red Hat Enterprise Linux 10 — versions 0:3.2.0-7.el10_2

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

secalert@redhat.com (x_refsource_REDHAT, Mitigation, vdb-entry, Vendor Advisory)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Issue Tracking, Vendor Advisory)
secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)

Frequently asked questions

What is CVE-2026-9064?: CVE-2026-9064 is a high-severity vulnerability in Red Hat Directory Server 11, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-05-20.
How severe is CVE-2026-9064?: High severity. CVSS v3 base score is 7.5 out of 10.