CVE-2026-105239: fallo de gravedad media en Apache log4net
Apache log4net: NUL character truncates EventLogAppender records
Publicada el · Actualizada el
13Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 5.3epss 0.3%
probabilidad de explotación
0.3%top 75% de las CVE
explotación observada
noninguna fuente lo reporta
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Productos afectados
Apache Software Foundation · Apache log4netCVEs relacionadas — Apache log4net
En el mismo producto, de las más peligrosas a las menos.
CVE-2026-105244MEDIUMApache log4net: RemoteSyslogAppender silently deletes non-ASCII contentEPSS 0.3%CVE-2026-105242MEDIUMApache log4net: Request validation failure drops the event in the aspnet-request converterEPSS 0.3%CVE-2026-105241MEDIUMApache log4net: Unencodable content discards a whole SmtpPickupDirAppender batchEPSS 0.3%CVE-2026-105243MEDIUMApache log4net: Oversize EventLogAppender record silently discardedEPSS 0.3%CVE-2026-105240MEDIUMApache log4net: NUL character truncates OutputDebugStringAppender recordsEPSS 0.3%