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.
No analysis available yet.
No remediation available yet.
Tracking
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Tue, 06 Oct 2026 20:30:00 +0000
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Tue, 06 Oct 2026 20:00:00 +0000
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| Description | 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. | |
| Title | Apache log4net: NUL character truncates EventLogAppender records | |
| Weaknesses | CWE-158 | |
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cvssV3_1
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Subscriptions
No data.
Status: PUBLISHED
Assigner: apache
Published:
Updated: 2026-10-06T19:58:29.347Z
Reserved: 2026-10-04T16:19:29.460Z
Link: CVE-2026-105239
Updated: 2026-10-06T19:58:23.907Z
Status : Received
Published: 2026-10-06T20:17:15.630
Modified: 2026-10-06T20:17:15.630
Link: CVE-2026-105239
No data.
OpenCVE Enrichment
No data.
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CWE-158
Improper Neutralization of Null Byte or NUL Character