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VULNERABILITIES

CVE-2026-105244 Details

Description

Improper Encoding or Escaping of Output vulnerability in the RemoteSyslogAppender of Apache log4net. Every character outside visible ASCII and space was removed from the record instead of being escaped, so non-ASCII text and control characters such as tabs disappeared without notice. A party whose data reaches a log message could make a distinct value look identical in the record, for example a user name holding a zero-width space logged as admin. Only applications that use RemoteSyslogAppender are affected. This issue affects Apache log4net: from 1.2.12 before 3.5.0. Users are recommended to upgrade to version 3.5.0, which fixes the issue.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
http://www.openwall.com/lists/oss-security/2026/10/07/19 CVE
https://github.com/apache/logging-log4net/commit/77717061b20d4346b6c0ce6b54643d85fb348bc7 [email protected]
https://github.com/apache/logging-log4net/pull/315 [email protected]
https://lists.apache.org/thread.html/q7649hhdodthoqw8jsjgtnb4m8qfy6d6 [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-116Improper Encoding or Escaping of Output[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-105244
NVD Published Date:
Oct 6, 2026
NVD Last Modified:
Oct 7, 2026
Source:
[email protected]