CVE-2026-105239

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Source
https://cve.org/CVERecord?id=CVE-2026-105239
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-105239.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-105239
Downstream
Published
2026-10-06T19:46:33Z
Modified
2026-10-08T02:49:47Z
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
Summary
Apache log4net: NUL character truncates EventLogAppender records
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.

Database specific 
{
    "cna_assigner": "apache",
    "cwe_ids": [
        "CWE-158"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105239.json"
}
References

Affected packages

Git / gitbox.apache.org/repos/asf/logging-log4net.git

Affected ranges

Type
GIT
Repo
https://gitbox.apache.org/repos/asf/logging-log4net.git
Events
Introduced
02e1e115435888485f2e28b414d267e39e799e07
Fixed
dc5855a0720c91590fd7a81d729ea01fdd69e000
Type
GIT
Repo
https://github.com/apache/logging-log4net
Events
Introduced
18a96716af733f7c6e4956526acdcc117a1bd461
Fixed
f7794ae187ab2e228e1754cb478568dd305d1b32
Fixed
dc5855a0720c91590fd7a81d729ea01fdd69e000
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "1.2.9"
        },
        {
            "fixed": "3.5.0"
        }
    ],
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Affected versions

rc/3.*
rc/3.0.1-preview.1
rc/3.0.1-preview.2
rc/3.0.1-rc1
rc/3.0.2-rc1
rc/3.0.3-preview.1
rc/3.0.3-rc1
rc/3.0.4-preview.1
rc/3.0.4-rc1
rc/3.1.0-rc1
rc/3.2.0-preview.1
rc/3.2.0-rc1
rc/3.3.0-rc1
rc/3.3.1-rc1
rc/3.3.2-rc1
rc/3.4.0-preview.1
rc/3.4.0-rc1
rc/3.4.1-preview.1
Other
rc/temp
rel/2.*
rel/2.0.10
rel/2.0.11
rel/2.0.12
rel/2.0.13
rel/2.0.14
rel/2.0.15
rel/2.0.16
rel/2.0.17
rel/2.x
rel/3.*
rel/3.0.1
rel/3.0.2
rel/3.0.3
rel/3.0.4
rel/3.1.0
rel/3.2.0
rel/3.3.0
rel/3.3.1
rel/3.3.2
rel/3.4.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-105239.json"