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
Affected Vendors & Products
References
History
Fri, 09 Oct 2026 15:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:apache:log4net:*:*:*:*:*:*:*:* |
Wed, 07 Oct 2026 15:30:00 +0000
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|---|---|---|
| Metrics |
ssvc
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Wed, 07 Oct 2026 07:30:00 +0000
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| References |
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Tue, 06 Oct 2026 23:15:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Apache
Apache log4net |
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| Vendors & Products |
Apache
Apache log4net |
Tue, 06 Oct 2026 20:00:00 +0000
| Type | Values Removed | Values Added |
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| 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. | |
| Title | Apache log4net: Request validation failure drops the event in the aspnet-request converter | |
| Weaknesses | CWE-755 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: apache
Published: 2026-10-06T19:50:19.075Z
Updated: 2026-10-07T14:49:06.441Z
Reserved: 2026-10-04T16:21:12.546Z
Link: CVE-2026-105242
Updated: 2026-10-07T06:11:58.703Z
Status : Analyzed
Published: 2026-10-06T20:17:16.037
Modified: 2026-10-09T15:28:34.500
Link: CVE-2026-105242
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