A flaw was found in 389 Directory Server. The dereference control plugin does not check for allocation failure before using a BER structure, allowing an unauthenticated remote attacker to crash the LDAP server when the system is under memory pressure.

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Fixes

Solution

No solution given by the vendor.


Workaround

Disable the deref plugin (most effective): dsconf <instance> plugin deref disable; systemctl restart dirsrv@<instance>. Disable anonymous access (nsslapd-allow-anonymous-access=off) to raise the bar from pre-auth to authenticated exploitation. Configure memory limits as defense-in-depth: set nsslapd-maxbersize and nsslapd-conntablesize, and deploy in a cgroup with memory limits.

History

Tue, 09 Jun 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 09 Jun 2026 13:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in 389 Directory Server. The dereference control plugin does not check for allocation failure before using a BER structure, allowing an unauthenticated remote attacker to crash the LDAP server when the system is under memory pressure.
Title 389-ds-base: 389-ds-base: null pointer dereference in deref control plugin ber parser
First Time appeared Redhat
Redhat directory Server
Redhat enterprise Linux
Weaknesses CWE-476
CPEs cpe:/a:redhat:directory_server:11
cpe:/a:redhat:directory_server:12
cpe:/a:redhat:directory_server:13
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat directory Server
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-06-09T15:12:38.533Z

Reserved: 2026-06-09T12:57:59.740Z

Link: CVE-2026-11788

cve-icon Vulnrichment

Updated: 2026-06-09T15:11:32.838Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-06-09T14:16:36.940

Modified: 2026-06-09T14:42:21.530

Link: CVE-2026-11788

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-09T15:00:07Z

Weaknesses