CVE-2026-105242
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Apache Software Foundation | Apache log4net | 1.2.11 < 3.5.0 | affected |
| Apache Software Foundation | Apache log4net | 243f1e9f3ee235955bade4b4fe664a903378719a < 145203420c579a703008b4b723b6a080757f4964 | affected |
Weaknesses
- CWE-755: CWE-755 Improper Handling of Exceptional Conditions
References
- https://github.com/apache/logging-log4net/pull/316
- https://github.com/apache/logging-log4net/commit/145203420c579a703008b4b723b6a080757f4964
- https://lists.apache.org/thread.html/zg6dbqm4ztm7j3c21nfsqj0yxm5yrpdx
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