UBUNTU-CVE-2026-34479

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-34479
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-34479
Upstream
Published
2026-04-10T16:16:00Z
Modified
2026-05-20T16:25:34.208781423Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N CVSS Calculator
  • 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

The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML 1.0 standard, producing malformed XML output. Conforming XML parsers are required to reject documents containing such characters with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records. Two groups of users are affected: * Those using Log4j1XmlLayout directly in a Log4j Core 2 configuration file. * Those using the Log4j 1 configuration compatibility layer with org.apache.log4j.xml.XMLLayout specified as the layout class. Users are advised to upgrade to Apache Log4j 1-to-Log4j 2 bridge version 2.25.4, which corrects this issue. Note: The Apache Log4j 1-to-Log4j 2 bridge is deprecated and will not be present in Log4j 3. Users are encouraged to consult the Log4j 1 to Log4j 2 migration guide https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html , and specifically the section on eliminating reliance on the bridge.

References

Affected packages

Ubuntu:18.04:LTS
apache-log4j1.2

Package

Name
apache-log4j1.2
Purl
pkg:deb/ubuntu/apache-log4j1.2?arch=source&distro=bionic

Affected ranges

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

Affected versions

1.*
1.2.17-7ubuntu2
1.2.17-8
1.2.17-8+deb10u1build0.18.04.1
1.2.17-8+deb10u1ubuntu0.1
1.2.17-8+deb10u1ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j1.2-java",
            "binary_version": "1.2.17-8+deb10u1ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=bionic

Affected ranges

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

Affected versions

2.*
2.8.2-1
2.8.2-2
2.10.0-1
2.10.0-2
2.10.0-2ubuntu0.1
2.12.4-0ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j2-java",
            "binary_version": "2.12.4-0ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
Ubuntu:20.04:LTS
apache-log4j1.2

Package

Name
apache-log4j1.2
Purl
pkg:deb/ubuntu/apache-log4j1.2?arch=source&distro=focal

Affected ranges

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

Affected versions

1.*
1.2.17-8
1.2.17-9
1.2.17-9ubuntu0.1
1.2.17-9ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j1.2-java",
            "binary_version": "1.2.17-9ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*
2.11.1-2
2.11.2-1
2.15.0-0.20.04.1
2.16.0-0.20.04.1
2.17.0-0.20.04.1
2.17.1-0.20.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j2-java",
            "binary_version": "2.17.1-0.20.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
Ubuntu:22.04:LTS
apache-log4j1.2

Package

Name
apache-log4j1.2
Purl
pkg:deb/ubuntu/apache-log4j1.2?arch=source&distro=jammy

Affected ranges

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

Affected versions

1.*
1.2.17-10
1.2.17-11

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j1.2-java",
            "binary_version": "1.2.17-11"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*
2.13.3-1
2.15.0-1
2.16.0-1
2.17.0-1
2.17.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j2-java",
            "binary_version": "2.17.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
Ubuntu:24.04:LTS
apache-log4j1.2

Package

Name
apache-log4j1.2
Purl
pkg:deb/ubuntu/apache-log4j1.2?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*
1.2.17-11

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j1.2-java",
            "binary_version": "1.2.17-11"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*
2.19.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j2-java",
            "binary_version": "2.19.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
Ubuntu:25.10
apache-log4j1.2

Package

Name
apache-log4j1.2
Purl
pkg:deb/ubuntu/apache-log4j1.2?arch=source&distro=questing

Affected ranges

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

Affected versions

1.*
1.2.17-11

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j1.2-java",
            "binary_version": "1.2.17-11"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=questing

Affected ranges

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

Affected versions

2.*
2.19.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j2-java",
            "binary_version": "2.19.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
Ubuntu:26.04:LTS
apache-log4j1.2

Package

Name
apache-log4j1.2
Purl
pkg:deb/ubuntu/apache-log4j1.2?arch=source&distro=resolute

Affected ranges

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

Affected versions

1.*
1.2.17-11
1.2.17-11build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j1.2-java",
            "binary_version": "1.2.17-11build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=resolute

Affected ranges

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

Affected versions

2.*
2.19.0-2
2.19.0-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j2-java",
            "binary_version": "2.19.0-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
Ubuntu:Pro:14.04:LTS
apache-log4j1.2

Package

Name
apache-log4j1.2
Purl
pkg:deb/ubuntu/apache-log4j1.2?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

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

Affected versions

1.*
1.2.17-3ubuntu1
1.2.17-4ubuntu1
1.2.17-4ubuntu2
1.2.17-4ubuntu3
1.2.17-4ubuntu3+esm1
1.2.17-4ubuntu3+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j1.2-java",
            "binary_version": "1.2.17-4ubuntu3+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
Ubuntu:Pro:16.04:LTS
apache-log4j2

Package

Name
apache-log4j2
Purl
pkg:deb/ubuntu/apache-log4j2?arch=source&distro=esm-apps%2Fxenial

Affected ranges

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

Affected versions

2.*
2.2-1
2.4-1
2.4-2
2.4-2ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j2-java",
            "binary_version": "2.4-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"
apache-log4j1.2

Package

Name
apache-log4j1.2
Purl
pkg:deb/ubuntu/apache-log4j1.2?arch=source&distro=esm-apps%2Fxenial

Affected ranges

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

Affected versions

1.*
1.2.17-6ubuntu1
1.2.17-7ubuntu1
1.2.17-7ubuntu1+esm1
1.2.17-7ubuntu1+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "liblog4j1.2-java",
            "binary_version": "1.2.17-7ubuntu1+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34479.json"