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CVE-2026-40021 Apache Log4net: Silent log event loss in XmlLayout and XmlLayoutSchemaLog4J due to unescaped XML 1.0 forbidden characters

🗓️ 10 Apr 2026 15:44:17Reported by GoogleType 
osv_cve
 osv_cve
🔗 osv.dev👁 26 Views

Log4net before 3.3.0 fails to sanitize XML forbidden characters in MDC data, causing silent log loss.

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21 Oct 2026 02:57Current
5.7Medium risk
Vulners AI Score5.7
CVSS 46.3
EPSS0.00772
26