TI-2026-66037 Aliases CVE-2026-103878 GHSA-vmxq-hqjm-cxv7

Apache Directory LDAP API: Injection of plaintext responses during StartTLS

LOW 38CWE-345Published 2026-10-02 · Updated 2026-10-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-345.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00202 10th percentileScored 2026-11-07

Fix Partial Apache Directory LDAP API (Apache Software Foundation): 2.1.9Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Apache	Apache Directory LDAP API	2.1.0 to before 2.1.9	2.1.9	Patch available	CNA

Apache Directory LDAP API VendorApache Affected 2.1.0 to before 2.1.9 Fixed in 2.1.9 Patch available CNA

Remediation

Fix · CNA Apache Directory LDAP API (Apache Software Foundation) Fixed in 2.1.9

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-02
Apache Directory LDAP API 2.1.9
4 records Highest priority Priority MEDIUM 1 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2026-66036 Apache Directory LDAP API: Unsafe loading of Java code from LDAP schema elementsPriority MEDIUM 49
- TI-2026-66039 Apache Directory LDAP API: Denial of service via crafted telephone number valuesPriority LOW 39
- TI-2026-66038 Apache Directory LDAP API: Denial of service via excessive bcrypt cost factor in stored passwordsPriority LOW 39
Show all 4 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Fuse 7	Affected	No fix planned: Out of support scope

Timeline

2026-10-02 Threatist record created from CVE-2026-103878
2026-10-03 Alias added: GHSA-vmxq-hqjm-cxv7
2026-10-05 CVSS score added · CISA ADP
2026-10-05 CISA SSVC decision points changed
2026-11-04 Affected versions changed · Red Hat
2026-11-04 CVSS score added · Red Hat

References

Advisory 1

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

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See all 4053 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences