CVE-2026-105240 Apache log4net: NUL character truncates OutputDebugStringAppender records

Improper Neutralization of Null Byte or NUL Character vulnerability in the OutputDebugStringAppender of Apache log4net. A NUL character in logged content ended the debug output record at that point, so everything the layout rendered after it, including exception text and trailing fields, was...

CVE-2026-105240

The Apache log4net logging framework (versions 1.2.9 before 3.5.0) is vulnerable to an Improper Neutralization of Null Byte or NUL Character (CWE-158) within the OutputDebugStringAppender . On Windows systems, a NUL character in logged content causes the debug output record to truncate prematurel...

EUVD-2026-93863

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...

CVE-2026-105239 Apache log4net: NUL character truncates EventLogAppender records

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...

CVE-2026-105239

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...

CVE-2026-105239 Apache log4net: NUL character truncates EventLogAppender records

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...

CVE-2026-105239 Apache log4net: NUL character truncates EventLogAppender records

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...

CVE-2026-105239

The Apache log4net library (versions 1.2.9 through 3.5.0) is vulnerable to an Improper Neutralization of Null Byte or NUL Character in the EventLogAppender . When a NUL character is present in logged content, it prematurely terminates the Windows Event Log record, causing subsequent data—such as ...

PT-2026-107179

Name of the Vulnerable Software and Affected Versions Apache log4net versions 1.2.9 through 3.4.x Description Improper neutralization of null bytes or NUL characters in the EventLogAppender allows a NUL character in logged content to truncate the Windows Event Log record. This results in all...

PT-2026-107236

Name of the Vulnerable Software and Affected Versions Apache log4net versions 1.2.12 through 3.4.x Description Improper encoding or escaping of output occurs in the RemoteSyslogAppender. Characters outside visible ASCII and space are removed from the record instead of being escaped, causing...

PT-2026-107232

Name of the Vulnerable Software and Affected Versions Apache log4net versions 1.2.9 through 3.4.x Description Improper neutralization of null bytes or NUL characters in the OutputDebugStringAppender allows logged content to be truncated. When a NUL character is present, the debug output record en...

PT-2026-107233

Name of the Vulnerable Software and Affected Versions Apache log4net versions 1.2.9 through 3.4.x Description Improper handling of Unicode encoding in the SmtpPickupDirAppender occurs when the mail file writer encounters content it cannot encode, such as an unpaired UTF-16 surrogate. This causes...

PT-2026-107234

Name of the Vulnerable Software and Affected Versions Apache log4net versions 1.2.11 through 3.4.x Description Improper handling of exceptional conditions in the aspnet-request pattern converter allows a sender to suppress the log record of their own request. When reading request parameters,...

PT-2026-107235

Name of the Vulnerable Software and Affected Versions Apache log4net versions 1.2.9 through 3.4.x Description Insufficient logging occurs in the EventLogAppender on Windows. Long messages are truncated to a fixed size that, when combined with log and source names, exceeds the Windows Event Log...

GHSA-4F7C-PMJV-C25W Apache Log4net: Silent log event loss in XmlLayout and XmlLayoutSchemaLog4J due to unescaped XML 1.0 forbidden characters

Apache Log4net's XmlLayout https://logging.apache.org/log4net/manual/configuration/layouts.htmllayout-list and XmlLayoutSchemaLog4J https://logging.apache.org/log4net/manual/configuration/layouts.htmllayout-list , in versions before 3.3.0, fail to sanitize characters forbidden by the XML 1.0...

CVE-2026-40021 Apache Log4net: Silent log event loss in XmlLayout and XmlLayoutSchemaLog4J due to unescaped XML 1.0 forbidden characters

Apache Log4net's XmlLayout https://logging.apache.org/log4net/manual/configuration/layouts.htmllayout-list and XmlLayoutSchemaLog4J https://logging.apache.org/log4net/manual/configuration/layouts.htmllayout-list , in versions before 3.3.0, fail to sanitize characters forbidden by the XML 1.0...

CVE-2026-40021: Improper Encoding or Escaping of Output

Apache Log4net's XmlLayout https://logging.apache.org/log4net/manual/configuration/layouts.htmllayout-list and XmlLayoutSchemaLog4J https://logging.apache.org/log4net/manual/configuration/layouts.htmllayout-list , in versions before 3.3.0, fail to sanitize characters forbidden by the XML 1.0...

EUVD-2022-3735

Malicious code in bioql PyPI...

SUSE CVE-2006-0743

Format string vulnerability in LocalSyslogAppender in Apache log4net 1.2.9 might allow remote attackers to cause a denial of service memory corruption and termination via unknown vectors...

K48127735: Apache log4net Vulnerability CVE-2018-1285

Apache log4net versions before 2.0.10 do not disable XML external entities when parsing log4net configuration files. This allows for XXE-based attacks in applications that accept attacker-controlled log4net configuration files. CVE-2018-1285 Impact There is no impact; F5 products are not affected...