5.3

CVE-2026-105242

Apache log4net: Request validation failure drops the event in the aspnet-request converter

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerApache Software Foundation
≫
Produkt Apache log4net
Default Statusunaffected
Version 1.2.11
Version < 3.5.0
Status affected
HerstellerApache Software Foundation
≫
Produkt Apache log4net
Default Statusunaffected
Version 243f1e9f3ee235955bade4b4fe664a903378719a
Version < 145203420c579a703008b4b723b6a080757f4964
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.34% 0.251
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Apache 5.3 3.9 1.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE-755 Improper Handling of Exceptional Conditions

The product does not handle or incorrectly handles an exceptional condition.

https://github.com/apache/logging-log4net/pull/316
https://github.com/apache/logging-log4net/commit/145203420c579a703008b4b723b6a080757f4964
https://lists.apache.org/thread.html/zg6dbqm4ztm7j3c21nfsqj0yxm5yrpdx
http://www.openwall.com/lists/oss-security/2026/10/07/16