Medium [CVE-2026-105241] Improper Handling of Unicode Encoding vulnerability in the SmtpPickupDirAppender of Apache log4net
This medium-severity Apache Software Foundation advisory covers CVE-2026-105241; related products: Apache log4net.
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Summary
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, and a truncated mail could be left in the pickup directory.
A party whose data reaches a log message could suppress the records of other events. Only applications that use SmtpPickupDirAppender 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.
- 1.2.9 before 3.5.0
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
- Users are recommended to upgrade to version 3.5.0, which fixes the issue.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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