---
id: CVE-2026-11884
title: >-
  389-ds-base: 389-ds-base: heap buffer overflow in schema objectclass
  serialization due to missing oc_superior in size calculation
summary: >-
  A heap buffer overflow flaw was found in 389 Directory Server. When
  serializing objectclass definitions, the oc_superior (SUP) field length is
  omitted from buffer size calculations in read_schema_dse() and
  schema_oc_to_string(), but the …
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-122
vendor: Red Hat
product: 'redhat-ds:11/389-ds-base'
affected:
  - 'redhat-ds:11/389-ds-base (all versions)'
  - 'redhat-ds:12/389-ds-base (all versions)'
  - 389-ds-base (all versions)
  - 389-ds-base (all versions)
  - 389-ds-base
  - 389-ds-base (all versions)
  - 389-ds-base (all versions)
  - 389-ds-base (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-10T16:26:44.246925Z'
published: '2026-06-10'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T16:22:55.109Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-11884'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-11884'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2423624'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2484913'
    label: RHBZ#2484913
tags:
  - cve.org
epss: 0.00349
epssPercentile: 0.28722
ingestedAt: '2026-11-05T22:38:31.347Z'
---

## Overview

A heap buffer overflow flaw was found in 389 Directory Server. When serializing objectclass definitions, the oc_superior (SUP) field length is omitted from buffer size calculations in read_schema_dse() and schema_oc_to_string(), but the field is still written via strcat(). An attacker with Directory Manager privileges, or a compromised replication supplier, can trigger a server crash by creating objectclasses with long SUP values. This is an incomplete fix variant of CVE-2025-14905.

## Affected

- `redhat-ds:11/389-ds-base (all versions)`
- `redhat-ds:12/389-ds-base (all versions)`
- `389-ds-base (all versions)`
- `389-ds-base (all versions)`
- `389-ds-base`
- `389-ds-base (all versions)`
- `389-ds-base (all versions)`
- `389-ds-base (all versions)`

## Remediation

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

### Workarounds

Restrict Directory Manager access. Audit replication agreements. Monitor cn=schema modifications for unusually long SUP values. Restrict LDAP replication traffic to trusted networks.