A NUL character in logged content ended the debug output record at that point, so everything the layout rendered after it, including exception text and trailing fields, was silently lost. A party whose data reaches a log message could hide the rest of that record. Only applications on Windows that use OutputDebugStringAppender 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.
Analysis and contextual insights are available on OpenCVE Cloud.
No solution or workaround provided in the CVE record.
Additional remediation guidance may be available on OpenCVE Cloud.
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Wed, 07 Oct 2026 07:30:00 +0000
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Wed, 07 Oct 2026 02:15:00 +0000
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| First Time appeared |
Apache
Apache log4net |
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| Vendors & Products |
Apache
Apache log4net |
Tue, 06 Oct 2026 20:00:00 +0000
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| Description | Improper Neutralization of Null Byte or NUL Character vulnerability in the OutputDebugStringAppender of Apache log4net. A NUL character in logged content ended the debug output record at that point, so everything the layout rendered after it, including exception text and trailing fields, was silently lost. A party whose data reaches a log message could hide the rest of that record. Only applications on Windows that use OutputDebugStringAppender 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. | |
| Title | Apache log4net: NUL character truncates OutputDebugStringAppender records | |
| Weaknesses | CWE-158 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: apache
Published:
Updated: 2026-10-07T16:27:16.989Z
Reserved: 2026-10-04T16:20:07.533Z
Link: CVE-2026-105240
No data.
Status : Awaiting Analysis
Published: 2026-10-06T20:17:15.777
Modified: 2026-10-07T17:16:46.480
Link: CVE-2026-105240
No data.
OpenCVE Enrichment
Updated: 2026-10-07T02:00:11Z
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CWE-158
Improper Neutralization of Null Byte or NUL Character