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.

The remote Fedora 45 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-6515ac01d8 advisory.

    Update log4net to 3.5.0. Nant is rebuilt (only dependency in Fedora).


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-105244)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Fedora 43 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-588bc7e01c advisory.

    Update log4net to 3.5.0. Nant is rebuilt (only dependency in Fedora).


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-0bf84c3130 advisory.

    Update log4net to 3.5.0. Nant is rebuilt (only dependency in Fedora).


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
374575	Fedora 45 : log4net / nant (2026-6515ac01d8)	Nessus	Fedora Local Security Checks	Local	medium
371385	Linux Distros Unpatched Vulnerability : CVE-2026-105244	Nessus	Misc.	Local	medium
366631	Fedora 43 : log4net / nant (2026-588bc7e01c)	Nessus	Fedora Local Security Checks	Local	medium
366623	Fedora 44 : log4net / nant (2026-0bf84c3130)	Nessus	Fedora Local Security Checks	Local	medium

Detections

Analytics

CVE-2026-105244

medium

Tenable Plugins

medium

medium

medium

medium