UBUNTU-CVE-2026-35563

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Source
https://ubuntu.com/security/CVE-2026-35563
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35563.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-35563
Upstream
Published
2026-06-01T08:16:00Z
Modified
2026-06-04T12:45:26Z
Severity
  • 8.8 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:L/SA:L CVSS Calculator
  • 8.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

It was identified that the LDAP client implementation in version 2.1.7 does not verify if the server certificate matches the intended LDAP hostname. While the underlying code validates the certificate chain against a trusted authority, the absence of endpoint identification allows a valid certificate issued for an entirely unrelated host to be improperly accepted. This oversight leaves the connection highly vulnerable to server impersonation and complete connection compromise. The root cause of this vulnerability lies in the incomplete TLS server identity verification within the LDAP client implementation. The attacker requires MITM capability on the network to exploit this vulnerability. This attacker must be able to present a certificate trusted by the client's configured trust store. The hostname verification has been enforced in the new version of the LDAP API

References

Affected packages

Ubuntu:16.04:LTS
apache-directory-api

Package

Name
apache-directory-api
Purl
pkg:deb/ubuntu/apache-directory-api?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.0~M20-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-directory-api-java",
            "binary_version": "1.0.0~M20-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35563.json"
Ubuntu:18.04:LTS
apache-directory-api

Package

Name
apache-directory-api
Purl
pkg:deb/ubuntu/apache-directory-api?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.0~M20-5
1.0.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-directory-api-java",
            "binary_version": "1.0.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35563.json"
Ubuntu:20.04:LTS
apache-directory-api

Package

Name
apache-directory-api
Purl
pkg:deb/ubuntu/apache-directory-api?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-directory-api-java",
            "binary_version": "1.0.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35563.json"
Ubuntu:22.04:LTS
apache-directory-api

Package

Name
apache-directory-api
Purl
pkg:deb/ubuntu/apache-directory-api?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-directory-api-java",
            "binary_version": "1.0.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35563.json"
Ubuntu:24.04:LTS
apache-directory-api

Package

Name
apache-directory-api
Purl
pkg:deb/ubuntu/apache-directory-api?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-directory-api-java",
            "binary_version": "2.1.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35563.json"
Ubuntu:25.10
apache-directory-api

Package

Name
apache-directory-api
Purl
pkg:deb/ubuntu/apache-directory-api?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1.2-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-directory-api-java",
            "binary_version": "2.1.2-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35563.json"
Ubuntu:26.04:LTS
apache-directory-api

Package

Name
apache-directory-api
Purl
pkg:deb/ubuntu/apache-directory-api?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1.2-2
2.1.2-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libapache-directory-api-java",
            "binary_version": "2.1.2-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35563.json"