Advisory severityMedium5.3Apache Software Foundation Updated

Medium [CVE-2026-105242] Improper Handling of Exceptional Conditions vulnerability in the aspnet-request pattern converter of Apache log4net

This medium-severity Apache Software Foundation advisory covers CVE-2026-105242; related products: Apache log4net.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-105242 Source published Oct 6, 2026Source updated Oct 7, 2026

VulniPulse record published Oct 6, 2026Record updated Oct 7, 2026

CVE-2026-105242

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Summary

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 versions

1.2.11 before 3.5.0

Official advisory · high-confidence parse· fetched 1 day ago·verify at source

Fixed versions

3.5.0

Official advisory · high-confidence parse· fetched 1 day ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Users are recommended to upgrade to version 3.5.0, which fixes the issue.

Official advisory · high-confidence parse· fetched 1 day ago·verify at source

Sources

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Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Apache Software Foundation
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-105242 instead of the raw feed document.
CVE Program

Cross-references

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CVE-2026-105242NVD CVE.org MITRE

Official resources

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Official documentation
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Apache project downloads (fixed releases)
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