Vulnerability/
https://seclists.org/oss-sec/2026/q4/35

https://seclists.org/oss-sec/2026/q4/35: CVE-2026-103878: Apache Dictory LDAP API: Injection of plaintext sponses during StartTLS

Q: Which deployments are affected?

Apache Directory LDAP API versions from 2.1.0 through versions before 2.1.9 are affected. The issue occurs when a StartTLS extended operation is initiated after a Search request has been sent.

Q: What can happen during exploitation?

Sensitive information may be received in cleartext before the TLS handshake has completed. The advisory describes this as injection of plaintext responses during StartTLS.

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 affected?

Apache Directory LDAP API versions from 2.1.0 through versions before 2.1.9 are affected. The issue occurs when a StartTLS extended operation is initiated after a Search request has been sent.

What can happen during exploitation?

Sensitive information may be received in cleartext before the TLS handshake has completed. The advisory describes this as injection of plaintext responses during StartTLS.

What is the recommended remediation?

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

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