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Vulnerability · Published Oct 2, 2026 · Assigned by apache

CVE-2026-103878Apache Directory LDAP API: Injection of plaintext responses during StartTLS

High 7.5

In plain English

A high-severity insufficient verification of data authenticity in Apache Directory LDAP API from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.2%top 89.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12apache-directory-apino fix listedDEBIAN-CVE-2026-103878
Debian:13apache-directory-apino fix listedDEBIAN-CVE-2026-103878
Debian:14apache-directory-apino fix listedDEBIAN-CVE-2026-103878
Ubuntu:22.04:LTSapache-directory-apino fix listedUBUNTU-CVE-2026-103878
Ubuntu:24.04:LTSapache-directory-apino fix listedUBUNTU-CVE-2026-103878
Ubuntu:26.04:LTSapache-directory-apino fix listedUBUNTU-CVE-2026-103878
Ubuntu:26.10apache-directory-apino fix listedUBUNTU-CVE-2026-103878

Affected products (as reported)

VendorProductVersions
Apache Software Foundation Apache Directory LDAP API 2.1.0 – before 2.1.9

Weakness: CWE-345 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References