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CVE-2026-105242 Details

Description

Improper Handling of Exceptional Conditions vulnerability in the aspnet-request pattern converter of Apache log4net. Reading request parameters triggers ASP.NET request validation, so a request carrying content such as markup made the layout throw and the appender discarded the whole event. A sender could suppress the log record of their own request. Only applications on ASP.NET for .NET Framework whose layout uses %aspnet-request are affected. This issue affects Apache log4net: from 1.2.11 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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URL	Source(s)	Tag(s)
http://www.openwall.com/lists/oss-security/2026/10/07/16	CVE
https://github.com/apache/logging-log4net/commit/145203420c579a703008b4b723b6a080757f4964	[email protected]
https://github.com/apache/logging-log4net/pull/316	[email protected]
https://lists.apache.org/thread.html/zg6dbqm4ztm7j3c21nfsqj0yxm5yrpdx	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-755	Improper Handling of Exceptional Conditions	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

3 change records found show changes

Date	Action	Recorded By
Oct 7, 2026	CVE Modified	CISA-ADP
Oct 7, 2026	CVE Modified	CVE
Oct 6, 2026	New CVE Received	[email protected]