UBUNTU-CVE-2026-59969

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Source
https://ubuntu.com/security/CVE-2026-59969
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59969.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-59969
Upstream
Published
2026-09-16T10:16:00Z
Modified
2026-09-24T02:00:36Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Apache ZooKeeper quorum TLS fails to enforce peer hostname verification in FIPS-mode deployments. When sslQuorum=true, zookeeper.fips-mode=true, ssl.quorum.hostnameVerification=true, and ssl.quorum.clientHostnameVerification=true are enabled, the Java SSLSocket quorum path accepts a CA-trusted peer certificate whose SAN does not match the connected host. A malicious or misissued peer certificate can therefore join quorum traffic, participate in leader election, and enter replication flows. Users are recommended to upgrade to version 3.8.7 or 3.9.6, which fixes the issue.

References

Affected packages

Ubuntu:20.04:LTS
zookeeper

Package

Name
zookeeper
Purl
pkg:deb/ubuntu/zookeeper?arch=source&distro=focal

Affected ranges

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

Affected versions

3.*
3.4.13-1
3.4.13-3
3.4.13-3build1
3.4.13-4
3.4.13-5
3.4.13-5build1
3.4.13-5ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzookeeper-java",
            "binary_version": "3.4.13-5ubuntu0.1"
        },
        {
            "binary_name": "libzookeeper-mt2",
            "binary_version": "3.4.13-5ubuntu0.1"
        },
        {
            "binary_name": "libzookeeper-st2",
            "binary_version": "3.4.13-5ubuntu0.1"
        },
        {
            "binary_name": "python3-zookeeper",
            "binary_version": "3.4.13-5ubuntu0.1"
        },
        {
            "binary_name": "zookeeper",
            "binary_version": "3.4.13-5ubuntu0.1"
        },
        {
            "binary_name": "zookeeper-bin",
            "binary_version": "3.4.13-5ubuntu0.1"
        },
        {
            "binary_name": "zookeeperd",
            "binary_version": "3.4.13-5ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59969.json"
Ubuntu:22.04:LTS
zookeeper

Package

Name
zookeeper
Purl
pkg:deb/ubuntu/zookeeper?arch=source&distro=jammy

Affected ranges

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

Affected versions

3.*
3.4.13-5ubuntu4
3.4.13-6ubuntu2
3.4.13-6ubuntu3
3.4.13-6ubuntu4
3.4.13-6ubuntu4.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzookeeper-java",
            "binary_version": "3.4.13-6ubuntu4.1"
        },
        {
            "binary_name": "libzookeeper-mt2",
            "binary_version": "3.4.13-6ubuntu4.1"
        },
        {
            "binary_name": "libzookeeper-st2",
            "binary_version": "3.4.13-6ubuntu4.1"
        },
        {
            "binary_name": "python3-zookeeper",
            "binary_version": "3.4.13-6ubuntu4.1"
        },
        {
            "binary_name": "zookeeper",
            "binary_version": "3.4.13-6ubuntu4.1"
        },
        {
            "binary_name": "zookeeper-bin",
            "binary_version": "3.4.13-6ubuntu4.1"
        },
        {
            "binary_name": "zookeeperd",
            "binary_version": "3.4.13-6ubuntu4.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59969.json"
Ubuntu:24.04:LTS
zookeeper

Package

Name
zookeeper
Purl
pkg:deb/ubuntu/zookeeper?arch=source&distro=noble

Affected ranges

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

Affected versions

3.*
3.8.0-11
3.9.1-1
3.9.1-1build1
3.9.1-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzookeeper-java",
            "binary_version": "3.9.1-1build2"
        },
        {
            "binary_name": "libzookeeper-mt2",
            "binary_version": "3.9.1-1build2"
        },
        {
            "binary_name": "libzookeeper-st2",
            "binary_version": "3.9.1-1build2"
        },
        {
            "binary_name": "python3-zookeeper",
            "binary_version": "3.9.1-1build2"
        },
        {
            "binary_name": "zookeeper",
            "binary_version": "3.9.1-1build2"
        },
        {
            "binary_name": "zookeeper-bin",
            "binary_version": "3.9.1-1build2"
        },
        {
            "binary_name": "zookeeperd",
            "binary_version": "3.9.1-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59969.json"
Ubuntu:26.04:LTS
zookeeper

Package

Name
zookeeper
Purl
pkg:deb/ubuntu/zookeeper?arch=source&distro=resolute

Affected ranges

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

Affected versions

3.*
3.9.3-1build2
3.9.3-1build3
3.9.4-1
3.9.5-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzookeeper-java",
            "binary_version": "3.9.5-1"
        },
        {
            "binary_name": "libzookeeper-mt2",
            "binary_version": "3.9.5-1"
        },
        {
            "binary_name": "libzookeeper-st2",
            "binary_version": "3.9.5-1"
        },
        {
            "binary_name": "python3-zookeeper",
            "binary_version": "3.9.5-1"
        },
        {
            "binary_name": "zookeeper",
            "binary_version": "3.9.5-1"
        },
        {
            "binary_name": "zookeeper-bin",
            "binary_version": "3.9.5-1"
        },
        {
            "binary_name": "zookeeperd",
            "binary_version": "3.9.5-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59969.json"
Ubuntu:Pro:14.04:LTS
zookeeper

Package

Name
zookeeper
Purl
pkg:deb/ubuntu/zookeeper?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

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

Affected versions

3.*
3.4.5+dfsg-1
3.4.5+dfsg-1ubuntu0.1~esm1
3.4.5+dfsg-1ubuntu0.1~esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzookeeper-java",
            "binary_version": "3.4.5+dfsg-1ubuntu0.1~esm3"
        },
        {
            "binary_name": "libzookeeper-mt2",
            "binary_version": "3.4.5+dfsg-1ubuntu0.1~esm3"
        },
        {
            "binary_name": "libzookeeper-st2",
            "binary_version": "3.4.5+dfsg-1ubuntu0.1~esm3"
        },
        {
            "binary_name": "libzookeeper2",
            "binary_version": "3.4.5+dfsg-1ubuntu0.1~esm3"
        },
        {
            "binary_name": "python-zookeeper",
            "binary_version": "3.4.5+dfsg-1ubuntu0.1~esm3"
        },
        {
            "binary_name": "zookeeper",
            "binary_version": "3.4.5+dfsg-1ubuntu0.1~esm3"
        },
        {
            "binary_name": "zookeeper-bin",
            "binary_version": "3.4.5+dfsg-1ubuntu0.1~esm3"
        },
        {
            "binary_name": "zookeeperd",
            "binary_version": "3.4.5+dfsg-1ubuntu0.1~esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59969.json"
Ubuntu:Pro:16.04:LTS
zookeeper

Package

Name
zookeeper
Purl
pkg:deb/ubuntu/zookeeper?arch=source&distro=esm-apps%2Fxenial

Affected ranges

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

Affected versions

3.*
3.4.6-8
3.4.7-1
3.4.8-1
3.4.8-1ubuntu0.1~esm1
3.4.8-1ubuntu0.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzookeeper-java",
            "binary_version": "3.4.8-1ubuntu0.1~esm2"
        },
        {
            "binary_name": "libzookeeper-mt2",
            "binary_version": "3.4.8-1ubuntu0.1~esm2"
        },
        {
            "binary_name": "libzookeeper-st2",
            "binary_version": "3.4.8-1ubuntu0.1~esm2"
        },
        {
            "binary_name": "libzookeeper2",
            "binary_version": "3.4.8-1ubuntu0.1~esm2"
        },
        {
            "binary_name": "python-zookeeper",
            "binary_version": "3.4.8-1ubuntu0.1~esm2"
        },
        {
            "binary_name": "zookeeper",
            "binary_version": "3.4.8-1ubuntu0.1~esm2"
        },
        {
            "binary_name": "zookeeper-bin",
            "binary_version": "3.4.8-1ubuntu0.1~esm2"
        },
        {
            "binary_name": "zookeeperd",
            "binary_version": "3.4.8-1ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59969.json"
Ubuntu:Pro:18.04:LTS
zookeeper

Package

Name
zookeeper
Purl
pkg:deb/ubuntu/zookeeper?arch=source&distro=esm-apps%2Fbionic

Affected ranges

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

Affected versions

3.*
3.4.10-2
3.4.10-3
3.4.13-3
3.4.13-3ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libzookeeper-java",
            "binary_version": "3.4.13-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "libzookeeper-mt2",
            "binary_version": "3.4.13-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "libzookeeper-st2",
            "binary_version": "3.4.13-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "python-zookeeper",
            "binary_version": "3.4.13-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "zookeeper",
            "binary_version": "3.4.13-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "zookeeper-bin",
            "binary_version": "3.4.13-3ubuntu0.1~esm1"
        },
        {
            "binary_name": "zookeeperd",
            "binary_version": "3.4.13-3ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59969.json"