---
id: CVE-2026-103877
title: >-
  Deserialization of Untrusted Data vulnerability in Apache Directory LDAP API.




  A rogue/compromised LDAP server (or pre-TLS MITM) can answer a client's
  loadSchema() subschema search with a schema object that contains a serialized
  Java c…
summary: >-
  Deserialization of Untrusted Data vulnerability in Apache Directory LDAP API.




  A rogue/compromised LDAP server (or pre-TLS MITM) can answer a client's
  loadSchema() subschema search with a schema object that contains a serialized
  Java c…
severity: none
cwe:
  - CWE-502
vendor: Apache Software Foundation
product: 'org.apache.directory.api:api-ldap-schema-data'
affected:
  - 'org.apache.directory.api:api-ldap-schema-data >= 2.1.0 < 2.1.9'
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T10:17:06.437'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103877'
references:
  - url: 'https://lists.apache.org/thread.html/sys8l881blqfgoc3o724jl32bmjl8pvw'
    label: security@apache.org
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-02T10:15:55.897Z'
---

## Overview

Deserialization of Untrusted Data vulnerability in Apache Directory LDAP API.



A rogue/compromised LDAP server (or pre-TLS MITM) can answer a client's loadSchema() subschema search with a schema object that contains a serialized Java class, allowing some potential RCE. 



This issue affects Apache Directory LDAP API: from 2.1.0 before 2.1.9.



Users are recommended to upgrade to version 2.1.9, which fixes the issue.

## Remediation

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