CVE-2026-105242

published 2026-10-06

CVE-2026-105242: Improper Handling of Exceptional Conditions vulnerability in the aspnet-request pattern converter of Apache log4net. Reading request parameters triggers…

Priority P4 33 medium 5.3 CVSS 3.1

AV N AC L PR N UI N S U C N I L A N

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.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
apache	log4net	>= 1.2.11 < 3.5.0	3.5.0
apache_software_foundation	apache_log4net	>= 1.2.11 < 3.5.0	3.5.0
apache_software_foundation	apache_log4net	>= 243f1e9f3ee235955bade4b4fe664a903378719a < 145203420c579a703008b4b723b6a080757f4964	145203420c579a703008b4b723b6a080757f4964

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CWE-755