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CVE-2026-103878

Apache Directory LDAP API: Injection of plaintext responses during StartTLS

7.5 High

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.20%Up 0.1 points since Oct 3, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.5

Apache Directory LDAP API: Injection of plaintext responses during StartTLS

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.

Record
CVE-2026-103878
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-345
Updated
2026-11-02
EUVDEUVD-2026-91378 7.5

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.

Record
EUVD-2026-91378
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-vmxq-hqjm-cxv7 7.5

Cleartext transmission of sensitive information vulnerability in Apache Directory LDAP API. A...

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.

Record
GHSA-vmxq-hqjm-cxv7
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-345
Updated
2026-11-02
NVD 7.5

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.

Record
CVE-2026-103878
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-345
Updated
2026-11-02
OSVDEBIAN-CVE-2026-103878 7.5

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.

Record
DEBIAN-CVE-2026-103878
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-103878 7.5

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.

Record
UBUNTU-CVE-2026-103878
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
apache-directory-api
Debian:12
 All versions, plus listed versions
2.1.2-12.1.2-2
 None known
apache-directory-api
Debian:13
 All versions, plus listed versions
2.1.2-2
 None known
apache-directory-api
Debian:14
 All versions, plus listed versions
2.1.2-2
 None known
apache-directory-api
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.0.0~M20-3
 None known
apache-directory-api
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.0.0~M20-51.0.0-1
 None known
apache-directory-api
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.0.0-1
 None known
apache-directory-api
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.0.0-2
 None known
apache-directory-api
Ubuntu:24.04:LTS
 All versions, plus listed versions
2.1.2-1
 None known
apache-directory-api
Ubuntu:26.10
 All versions, plus listed versions
2.1.2-2build1
 None known
apache-directory-api
Ubuntu:26.04:LTS
 All versions, plus listed versions
2.1.2-22.1.2-2build1
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-103878 is a high vulnerability (CVSS 7.5) in Apache Software Foundation Directory Ldap Api, published October 2, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.20%, the 10th percentile. No source names a fixed version.

References

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