UBUNTU-CVE-2026-105243

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-105243
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-105243.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-105243
Upstream
Published
2026-10-06T20:17:00Z
Modified
2026-10-17T12:58:42Z
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

Insufficient Logging vulnerability in the EventLogAppender of Apache log4net. Long messages were truncated to a fixed size that exceeds what the Windows Event Log accepts once the log and source names are counted, and the event log then stored nothing and reported nothing. A party whose data reaches a log message could suppress the whole record by making it long enough. 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-2026-105243.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-2026-105243.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-2026-105243.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-2026-105243.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-2026-105243.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-2026-105243.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-2026-105243.json"