CVE WatchOct 9, 2026

CVE-2026-105242

Improper Handling of Exceptional Conditions vulnerability in the aspnet-request pattern converter of Apache log4net. Reading request parame

CVSS

5.3

Medium

EPSS

0.8%

p57

KEV

—

Exploit Today

0-100

Published: Oct 6, 2026 · Last modified: Oct 9, 2026 · CWE-755

EPSS · 30d

0.3%EPSS · 30 days0.8%

2026-10-072026-10-19

Technical 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.

Official references

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