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CVE PROGRAM SOURCE RECORD5.3 Medium

CVE-2026-105240

Apache log4net: NUL character truncates OutputDebugStringAppender records

Description

Improper Neutralization of Null Byte or NUL Character vulnerability in the OutputDebugStringAppender of Apache log4net. A NUL character in logged content ended the debug output record at that point, so everything the layout rendered after it, including exception text and trailing fields, was silently lost. A party whose data reaches a log message could hide the rest of that record. Only applications on Windows that use OutputDebugStringAppender 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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Apache Software Foundation Apache log4net

Default version status: unaffected

  • 1.2.9 to < 3.5.0affected
pkg:nuget/log4net

Apache Software Foundation Apache log4net

Default version status: unaffected

  • 02e1e115435888485f2e28b414d267e39e799e07 to < 6046fe9d7f353b49fe995361c071ec2eea8f7ef6affected
pkg:nuget/log4net

References