---
id: CVE-2026-103552
title: >-
  Stack Overflow vulnerability in Apache Directory LDAP API.




  Before binding, a client can send a deeply nested search filter that overflows
  the stack in the server's decoder.




  This issue affects Apache Directory LDAP API: from 1.2.0 b…
summary: >-
  Stack Overflow vulnerability in Apache Directory LDAP API.




  Before binding, a client can send a deeply nested search filter that overflows
  the stack in the server's decoder.




  This issue affects Apache Directory LDAP API: from 1.2.0 b…
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-121
  - CWE-770
vendor: Apache Software Foundation
product: 'org.apache.directory.api:api-ldap-codec-core'
affected:
  - 'org.apache.directory.api:api-ldap-codec-core >= 1.2.0 < 1.2.9'
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T22:16:53.420'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103552'
references:
  - url: 'https://lists.apache.org/thread.html/fn3bwknn57266hx66w9vv6b4k8rfwcx7'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/10/02/4'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103552.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-103552'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2544996'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-103552'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103552'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-02T18:29:24.190444Z'
epss: 0.00327
epssPercentile: 0.25628
ingestedAt: '2026-10-02T10:15:55.896Z'
scores:
  nvd: 7.3
  vendor: 7.5
---

## Overview

Stack Overflow vulnerability in Apache Directory LDAP API.



Before binding, a client can send a deeply nested search filter that overflows the stack in the server's decoder.



This issue affects Apache Directory LDAP API: from 1.2.0 before 1.2.9.



Users are recommended to upgrade to version 1.2.9, which fixes the issue.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Fuse 7 · no fix planned: Red Hat Fuse 7 · updated 2026-10-02 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103552.json)