UBUNTU-CVE-2026-40023

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Source
https://ubuntu.com/security/CVE-2026-40023
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40023.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-40023
Upstream
Published
2026-04-10T16:16:00Z
Modified
2026-05-20T16:25:38Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N CVSS Calculator
  • 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

Apache Log4cxx's XMLLayout https://logging.apache.org/log4cxx/1.7.0/classlog4cxx_1_1xml_1_1XMLLayout.html , in versions before 1.7.0, fails to sanitize characters forbidden by the XML 1.0 specification https://www.w3.org/TR/xml/#charsets in log messages, NDC, and MDC property keys and values, producing invalid XML output. Conforming XML parsers must reject such documents with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records. An attacker who can influence logged data can exploit this to suppress individual log records, impairing audit trails and detection of malicious activity. Users are advised to upgrade to Apache Log4cxx 1.7.0, which fixes this issue.

References

Affected packages

Ubuntu:14.04:LTS
log4cxx

Package

Name
log4cxx
Purl
pkg:deb/ubuntu/log4cxx?arch=source&distro=trusty

Affected ranges

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

Affected versions

0.*
0.10.0-1.2ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4cxx10",
            "binary_version": "0.10.0-1.2ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40023.json"
Ubuntu:16.04:LTS
log4cxx

Package

Name
log4cxx
Purl
pkg:deb/ubuntu/log4cxx?arch=source&distro=xenial

Affected ranges

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

Affected versions

0.*
0.10.0-9ubuntu1
0.10.0-9ubuntu2
0.10.0-10ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4cxx10v5",
            "binary_version": "0.10.0-10ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40023.json"
Ubuntu:18.04:LTS
log4cxx

Package

Name
log4cxx
Purl
pkg:deb/ubuntu/log4cxx?arch=source&distro=bionic

Affected ranges

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

Affected versions

0.*
0.10.0-12ubuntu1
0.10.0-13ubuntu1
0.10.0-13ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4cxx10v5",
            "binary_version": "0.10.0-13ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40023.json"
Ubuntu:20.04:LTS
log4cxx

Package

Name
log4cxx
Purl
pkg:deb/ubuntu/log4cxx?arch=source&distro=focal

Affected ranges

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

Affected versions

0.*
0.10.0-15ubuntu1
0.10.0-15ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4cxx10v5",
            "binary_version": "0.10.0-15ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40023.json"
Ubuntu:22.04:LTS
log4cxx

Package

Name
log4cxx
Purl
pkg:deb/ubuntu/log4cxx?arch=source&distro=jammy

Affected ranges

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

Affected versions

0.*
0.11.0-2ubuntu1
0.11.0-3ubuntu2
0.12.1-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4cxx12",
            "binary_version": "0.12.1-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40023.json"
Ubuntu:24.04:LTS
log4cxx

Package

Name
log4cxx
Purl
pkg:deb/ubuntu/log4cxx?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*
1.1.0-1
1.1.0-1build1
1.1.0-1build2
1.1.0-1build3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4cxx15",
            "binary_version": "1.1.0-1build3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40023.json"
Ubuntu:25.10
log4cxx

Package

Name
log4cxx
Purl
pkg:deb/ubuntu/log4cxx?arch=source&distro=questing

Affected ranges

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

Affected versions

1.*
1.3.1-1
1.4.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4cxx15",
            "binary_version": "1.4.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40023.json"
Ubuntu:26.04:LTS
log4cxx

Package

Name
log4cxx
Purl
pkg:deb/ubuntu/log4cxx?arch=source&distro=resolute

Affected ranges

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

Affected versions

1.*
1.4.0-1
1.5.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4cxx15",
            "binary_version": "1.5.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40023.json"