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CVE details

CVE-2026-105241

Improper Handling of Unicode Encoding vulnerability in the SmtpPickupDirAppender of Apache log4net. Content that the mail file writer cannot encode, such as an unpaired UTF-16 surrogate, made the write throw. Every buffered event in the batch was discarded, not only the one carrying the content, and a truncated mail could be left in the pickup directory. A party whose data reaches a log message could suppress the records of other events. Only applications that use SmtpPickupDirAppender 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.

Score
5.3 medium
Published
2026-10-06
Links
NVD · cve.org

Affected ports (1)

PortPackageVersionStatusMaintainer
devel/log4netlog4net1.2.10_5unaddressedports@FreeBSD.org

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>log4net</name>
	<range><lt>3.5.0</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>Improper Handling of Unicode Encoding vulnerability in the
	SmtpPickupDirAppender of Apache log4net.

Content that the mail file
	writer cannot encode, such as an unpaired UTF-16 surrogate, made the
	write throw. Every buffered event in the batch was discarded, not only
	the one carrying the content, and a truncated mail could be left in
	the pickup directory. A party whose data reaches a log message could
	suppress the records of other events. Only applications that use
	SmtpPickupDirAppender 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.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-105241</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-105241</url>
    </references>
    <dates>
      <discovery>2026-10-06</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>