---
id: CVE-2026-11788
title: A flaw was found in 389 Directory Server
summary: >-
  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 me…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: redhat
product: directory_server
affected:
  - directory_server = 11.0
  - directory_server = 12.0
  - directory_server = 13.0
  - 389_directory_server
  - enterprise_linux = 7.0
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - enterprise_linux = 10.0
published: '2026-06-09'
updated: '2026-08-17'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-11788'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:55421'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:55422'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:55425'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-11788'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2485423'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00561
epssPercentile: 0.4435
ingestedAt: '2026-08-17T02:45:45.532Z'
---

## Overview

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.

## Affected

- `directory_server = 11.0`
- `directory_server = 12.0`
- `directory_server = 13.0`
- `389_directory_server`
- `enterprise_linux = 7.0`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `enterprise_linux = 10.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.