UBUNTU-CVE-2026-59739

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Source
https://ubuntu.com/security/CVE-2026-59739
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59739.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-59739
Upstream
Published
2026-09-16T10:16:00Z
Modified
2026-09-24T02:00:25Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Information disclosure via SetWatches reconnect replay in Apache ZooKeeper due to missing ACL check. An attacker can discover ACL-restricted paths by registering exists-watches on non-existent paths, then reconnecting after the paths are created with restricted ACLs. Issue is caused by incomplete fix for CVE-2024-23944 (ZOOKEEPER-4799). The fix added ACL checking to WatchManager.triggerWatch(). However, DataTree.setWatches() — the SetWatches/SetWatches2 reconnect replay handler — still calls watcher.process(event) with null ACL, bypassing the check entirely. It's important to note that only the path is exposed by this vulnerability, not the data of znode, but since znode path can contain sensitive information like user name or login ID, this issue is potentially critical. Users are recommended to upgrade to version 3.9.6, 3.8.7 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-2026-59739.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-2026-59739.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-2026-59739.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-2026-59739.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-2026-59739.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-2026-59739.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-2026-59739.json"