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VULNERABILITIES

CVE-2026-105240 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
http://www.openwall.com/lists/oss-security/2026/10/07/18 CVE
https://github.com/apache/logging-log4net/commit/6046fe9d7f353b49fe995361c071ec2eea8f7ef6 [email protected]
https://github.com/apache/logging-log4net/pull/315 [email protected]
https://lists.apache.org/thread.html/gyw2d4ppy82t1vlpdknkfd1nmzp21z17 [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-158Improper Neutralization of Null Byte or NUL Character[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-105240
NVD Published Date:
Oct 6, 2026
NVD Last Modified:
Oct 7, 2026
Source:
[email protected]
CVE-2026-105240 Details - Not Deferred