UBUNTU-CVE-2026-105239

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Source
https://ubuntu.com/security/CVE-2026-105239
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-105239.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-105239
Upstream
Published
2026-10-06T20:17:00Z
Modified
2026-10-17T12:59:46Z
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

Improper Neutralization of Null Byte or NUL Character vulnerability in the EventLogAppender of Apache log4net. A NUL character in logged content ended the Windows Event Log record at that point, so everything the layout rendered after it, including exception text and trailing fields, was silently not stored. A party whose data reaches a log message could hide the rest of that record. Only applications on Windows that use EventLogAppender are affected. This issue affects Apache log4net: from 1.2.9 before 3.5.0. Users are recommended to upgrade to version 3.5.0, which fixes the issue.

References

Affected packages

Ubuntu:16.04:LTS
log4net

Package

Name
log4net
Purl
pkg:deb/ubuntu/log4net?arch=source&distro=xenial

Affected ranges

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

Affected versions

1.*
1.2.10+dfsg-6
1.2.10+dfsg-7
1.2.10+dfsg-7ubuntu0.16.04.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "liblog4net1.2-cil",
            "binary_version":  "1.2.10+dfsg-7ubuntu0.16.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-105239.json"
Ubuntu:18.04:LTS
log4net

Package

Name
log4net
Purl
pkg:deb/ubuntu/log4net?arch=source&distro=bionic

Affected ranges

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

Affected versions

1.*
1.2.10+dfsg-7
1.2.10+dfsg-7ubuntu0.18.04.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "liblog4net1.2-cil",
            "binary_version":  "1.2.10+dfsg-7ubuntu0.18.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-105239.json"
Ubuntu:20.04:LTS
log4net

Package

Name
log4net
Purl
pkg:deb/ubuntu/log4net?arch=source&distro=focal

Affected ranges

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

Affected versions

1.*
1.2.10+dfsg-7
1.2.10+dfsg-7ubuntu0.20.04.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "liblog4net1.2-cil",
            "binary_version":  "1.2.10+dfsg-7ubuntu0.20.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-105239.json"
Ubuntu:22.04:LTS
log4net

Package

Name
log4net
Purl
pkg:deb/ubuntu/log4net?arch=source&distro=jammy

Affected ranges

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

Affected versions

1.*
1.2.10+dfsg-8

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "liblog4net1.2-cil",
            "binary_version":  "1.2.10+dfsg-8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-105239.json"
Ubuntu:24.04:LTS
log4net

Package

Name
log4net
Purl
pkg:deb/ubuntu/log4net?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*
1.2.10+dfsg-8
1.2.10+dfsg-9

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "liblog4net1.2-cil",
            "binary_version":  "1.2.10+dfsg-9"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-105239.json"
Ubuntu:26.04:LTS
log4net

Package

Name
log4net
Purl
pkg:deb/ubuntu/log4net?arch=source&distro=resolute

Affected ranges

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

Affected versions

1.*
1.2.10+dfsg-9
1.2.10+dfsg-9build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "liblog4net1.2-cil",
            "binary_version":  "1.2.10+dfsg-9build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-105239.json"
Ubuntu:26.10
log4net

Package

Name
log4net
Purl
pkg:deb/ubuntu/log4net?arch=source&distro=stonking

Affected ranges

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

Affected versions

1.*
1.2.10+dfsg-9build1
1.2.10+dfsg-10

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "liblog4net1.2-cil",
            "binary_version":  "1.2.10+dfsg-10"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-105239.json"