CVE-2026-105242
Improper Handling of Exceptional Conditions vulnerability in the aspnet-request pattern converter…
- Risk score
- 43/100
- CVSS
- 5.3 v3.1
- Exploit chance (30 days)
- 0.8%
- Published
- 6 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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…
- Affected
- Apache log4net before 3.5.0
- Fix
- Upgrade Apache log4net to 3.5.0 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 5.3 medium
References
Original 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.
Last activity 6 Oct 2026. Patch Forecast updates every hour.