log4net vulnerabilities

Browse known CVEs and advisories by package and ecosystem. Severity tells you the worst case. What determines real risk is whether the vulnerable code actually runs in your applications.

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CVE-IDSeverityPackage summary
CVE-2026-40021Mediumlog4net: Apache Log4net: Silent log event loss in XmlLayout and XmlLayoutSchemaLog4J due to unescaped XML 1.0 forbidden charactersCVE-2006-0743Mediumlog4net: Apache log4net format string vulnerability causes DoSCVE-2018-1285Criticallog4net: XML External Entity attack in log4net

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