Denial of Service Vulnerability in 389-ds-base LDAP Server by Red Hat
CVE-2026-9064

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Directory Server 11
Red Hat Directory Server 12
Red Hat Directory Server 13
Red Hat Enterprise Linux 10
Vendor
CVE Published:
20 May 2026

What is CVE-2026-9064?

A flaw exists in the 389-ds-base LDAP server with the get_ldapmessage_controls_ext() function that allows a remote, unauthenticated attacker to exploit the server. By sending a crafted LDAP request containing excessive controls, an attacker can consume significant CPU resources and trigger heap allocation issues. This exploitation could lead to severe latency, worker thread starvation, or out-of-memory conditions, ultimately resulting in a denial of service that impacts the availability and performance of the LDAP server.

References

https://access.redhat.com/security/cve/CVE-2026-9064
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2480093
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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