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CVE-2026-105242

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

Description (CNA)

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 (CNA)

Vendor / productVersions
Apache Software Foundation / Apache log4netaffected 1.2.11 before 3.5.0
Apache Software Foundation / Apache log4netaffected 243f1e9f3ee235955bade4b4fe664a903378719a before 145203420c579a703008b4b723b6a080757f4964

CWE

CWE-755

References

ADP enrichment

CVE

No English description supplied.

CISA-ADP

No English description supplied.

No references supplied.