CVE-2026-103878: Apache Software Foundation Apache Directory LDAP API

High severity, CVSS 7.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Cleartext transmission of sensitive information vulnerability in Apache Directory LDAP API. A StartTLS extended operation started after a Search request has been sent can lead to receive data in plain text before the TLS Handshake has been completed. 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.

Affected products

• Apache Software Foundation Apache Directory LDAP API: from 2.1.0, before 2.1.9 (fixed in 2.1.9)

Published 2026-10-02. Last modified 2026-10-05.