---
title: "CVE-2026-103552: Apache Directory LDAP API - Denial of Service"
description: "Apache Directory LDAP API >= 1.2.0 < 1.2.9 contains a stack overflow caused by processing deeply nested search filters in the server's decoder, letting remote attackers cause denial of service, exploit requires sending crafted nested filters."
url: https://panop.io/threat-heartbeat/CVE-2026-103552/
---

# CVE-2026-103552 Apache Directory LDAP API - Denial of Service

Apache Directory LDAP API >= 1.2.0 < 1.2.9 contains a stack overflow caused by processing deeply nested search filters in the server's decoder, letting remote attackers cause denial of service, exploit requires sending crafted nested filters.

CVSS base score 7.3 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.34% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-103552)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Published

2 October 2026

Updated

15 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Upgrade to version 1.2.9.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-103552](https://nvd.nist.gov/vuln/detail/CVE-2026-103552)
- [https://lists.apache.org/thread.html/fn3bwknn57266hx66w9vv6b4k8rfwcx7](https://lists.apache.org/thread.html/fn3bwknn57266hx66w9vv6b4k8rfwcx7)
- [http://www.openwall.com/lists/oss-security/2026/10/02/4](http://www.openwall.com/lists/oss-security/2026/10/02/4)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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