CVE catalog
CVE-2026-105239
DEBIAN-CVE-2026-105239
- Severity
- Unknown
- Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.82% · Oct 25, 2026
Improper Neutralization of Null Byte or NUL Character vulnerability in the EventLogAppender of Apache log4net. A NUL character in logged content ended the Windows Event Log record at that point, so everything the layout rendered after it, including exception text and trailing fields, was silently not stored. A party whose data reaches a log message could hide the rest of that record. 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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | log4net | 13 | 1.2.10+dfsg-10 | vulnerable |
| Debian | log4net | 13 | 1.2.10+dfsg-9 | vulnerable |
| Debian | log4net | 14 | 1.2.10+dfsg-10 | vulnerable |
| Debian | log4net | 14 | 1.2.10+dfsg-9 | vulnerable |
Fixed-version evidence
OpenFactory catalog packages
[Debian 13 (Trixie)]
- [liblog4net1.2-cil]Affected
Source package: [log4net]
Details (2)
1.2.10+dfsg-9· all · trixieAffected
pypi · log4net · debian · 13
1.2.10+dfsg-9· all · trixieAffected
pypi · log4net · debian · 13
- [liblog4net-cil-dev]Affected
Source package: [log4net]
Details (2)
1.2.10+dfsg-9· all · trixieAffected
pypi · log4net · debian · 13
1.2.10+dfsg-9· all · trixieAffected
pypi · log4net · debian · 13
Observed: