UBUNTU-CVE-2026-84439

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Source
https://ubuntu.com/security/CVE-2026-84439
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84439.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-84439
Upstream
Published
2026-09-16T10:16:00Z
Modified
2026-09-24T02:01:05Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

When audit logging is enabled (zookeeper.audit.enable=true), an unauthenticated attacker can inject arbitrary fields into Apache ZooKeeper's audit log by sending a digest authentication request with tab characters (\t) embedded in the username. Because the audit log uses tab-separated key=value format, the injected tabs are parsed as legitimate field separators, allowing the attacker to spoof audit results (e.g., injecting result=success), forge operation types, and corrupt forensic evidence. A log injection vulnerability in Apache ZooKeeper allows a client that can call setACL to inject forged key-value fields into zookeeper_audit.log. When audit logging is enabled, the server serializes attacker-controlled digest ACL ids into the acl= audit field without escaping tab characters. Because audit events are emitted as tab-separated key=value records, a crafted ACL id can make one successful setAcl event appear to contain forged fields such as operation=delete and znode=/forged. This undermines the integrity of downstream audit parsing, alerting, and incident response. This issue affects Apache ZooKeeper: from 3.9.0 through 3.9.5, from 3.8.0 through 3.8.6. Users are recommended to upgrade to version 3.9.6 or 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-2026-84439.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-2026-84439.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-2026-84439.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-2026-84439.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-2026-84439.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-2026-84439.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-2026-84439.json"