CVE-2026-105243

Description

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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Produits concernés

• Apache Software Foundation Apache log4net
• Apache log4net

Scores CVSS

Faiblesses (CWE)

• CWE-778

Références

• https://github.com/apache/logging-log4net/commit/28fbfb25678c48a8cc5bc9b94ead0dddfc39ffed Patch
• https://github.com/apache/logging-log4net/pull/315 Patch
• https://lists.apache.org/thread.html/jr6fj5skv1vnjbc9jmt8bp151p8ow1rp Mailing ListVendor Advisory
• http://www.openwall.com/lists/oss-security/2026/10/07/17 Mailing ListThird Party Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories