CVE-2026-105241

The Apache log4net logging framework (versions 1.2.9 before 3.5.0 ) is vulnerable to an Improper Handling of Unicode Encoding issue within the SmtpPickupDirAppender component. If the mail file writer encounters content it cannot encode, such as an unpaired UTF-16 surrogate , it causes the write o...

CVE-2026-105241 Apache log4net: Unencodable content discards a whole SmtpPickupDirAppender batch

Improper Handling of Unicode Encoding vulnerability in the SmtpPickupDirAppender of Apache log4net. Content that the mail file writer cannot encode, such as an unpaired UTF-16 surrogate, made the write throw. Every buffered event in the batch was discarded, not only the one carrying the content,...

CVE-2026-105241

Improper Handling of Unicode Encoding vulnerability in the SmtpPickupDirAppender of Apache log4net. Content that the mail file writer cannot encode, such as an unpaired UTF-16 surrogate, made the write throw. Every buffered event in the batch was discarded, not only the one carrying the content,...