Vulnerability/
https://seclists.org/oss-sec/2026/q4/37

https://seclists.org/oss-sec/2026/q4/37: CVE-2026-103885: Apache Dictory LDAP API: Denial of service via crafted telephone number values

Q: Which deployments are exposed to this issue?

LDAP servers that use Apache Directory LDAP API are affected, including examples such as Apache DS, when running versions from 2.1.0 before 2.1.9.

Q: What does an attacker need to do to trigger the denial of service?

The server must process a badly crafted Telephone Number value. Processing that value can cause the server to consume 100% of a CPU core indefinitely.

Q: What is the recommended remediation?

Upgrade Apache Directory LDAP API to version 2.1.9, which fixes the issue.

Published Oct 2, 2026

Updated

Affected Software

1 affected component

Apache Directory LDAP API>=2.1.0<2.1.9

Frequently Asked Questions

Which deployments are exposed to this issue?

LDAP servers that use Apache Directory LDAP API are affected, including examples such as Apache DS, when running versions from 2.1.0 before 2.1.9.

What does an attacker need to do to trigger the denial of service?

The server must process a badly crafted Telephone Number value. Processing that value can cause the server to consume 100% of a CPU core indefinitely.

What is the recommended remediation?

Upgrade Apache Directory LDAP API to version 2.1.9, which fixes the issue.

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Contact

SecAlerts Pty Ltd.
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Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

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