GHSA-r5vq-477m-wcfcMediumCVSS 5.3
Improper Handling of Unicode Encoding vulnerability in the SmtpPickupDirAppender of Apache...
🔗 CVE IDs covered (1)
📋 Description
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.
🔗 References (6)
- https://nvd.nist.gov/vuln/detail/CVE-2026-105241
- https://github.com/apache/logging-log4net/pull/315
- https://github.com/apache/logging-log4net/commit/4d2e10f0908199604b4326f9df6d0b43b871e333
- https://lists.apache.org/thread.html/hg8dgh3oy8bp3dhb8nsygk9kw2o401ws
- http://www.openwall.com/lists/oss-security/2026/10/07/15
- https://github.com/advisories/GHSA-r5vq-477m-wcfc