CVE-2026-105240
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Apache Software Foundation | Apache log4net | 1.2.9 < 3.5.0 | affected |
| Apache Software Foundation | Apache log4net | 02e1e115435888485f2e28b414d267e39e799e07 < 6046fe9d7f353b49fe995361c071ec2eea8f7ef6 | affected |
Weaknesses
- CWE-158: CWE-158 Improper Neutralization of Null Byte or NUL Character
References
- https://github.com/apache/logging-log4net/pull/315
- https://github.com/apache/logging-log4net/commit/6046fe9d7f353b49fe995361c071ec2eea8f7ef6
- https://lists.apache.org/thread.html/gyw2d4ppy82t1vlpdknkfd1nmzp21z17
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