CVE Watch9 oct 2026

CVE-2026-105243

Insufficient Logging vulnerability in the EventLogAppender of Apache log4net. Long messages were truncated to a fixed size that exceeds wha

CVSS

5.3

Medio

EPSS

0.8%

p56

KEV

—

Exploit Today

0-100

Publicado: 6 oct 2026 · Última mod.: 9 oct 2026 · CWE-778

EPSS · 30d

0.3%EPSS · 30 días0.8%

2026-10-072026-10-22

Descripción técnica

Insufficient Logging vulnerability in the EventLogAppender of Apache log4net. Long messages were truncated to a fixed size that exceeds what the Windows Event Log accepts once the log and source names are counted, and the event log then stored nothing and reported nothing. A party whose data reaches a log message could suppress the whole record by making it long enough. Only applications on Windows that use EventLogAppender are affected. This issue affects Apache log4net: from 1.2.9 before 3.5.0. Users are recommended to upgrade to version 3.5.0, which fixes the issue.

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