LDAP Denial of Service in 389-ds-base by Red Hat
CVE-2026-86344

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:
1 October 2026

What is CVE-2026-86344?

A vulnerability was identified in 389-ds-base where an unauthenticated remote attacker can exploit a flaw by sending an incomplete LDAPMessage. This can cause a server to incorrectly handle the connection, allowing the attacker to exhaust the worker thread pool. As a result, both anonymous and authenticated clients may experience service denial while the attacker persists in maintaining connections. This presents significant operational risks to environments relying on 389-ds-base for directory services.

References

https://access.redhat.com/security/cve/CVE-2026-86344
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2529329
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 xclow3n for reporting this issue.
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