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.
Analysis and contextual insights are available on OpenCVE Cloud.
No solution or workaround provided in the CVE record.
Additional remediation guidance may be available on OpenCVE Cloud.
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Wed, 07 Oct 2026 15:30:00 +0000
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| Metrics |
ssvc
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Wed, 07 Oct 2026 07:30:00 +0000
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Wed, 07 Oct 2026 01:15:00 +0000
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| First Time appeared |
Apache
Apache log4net |
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| Vendors & Products |
Apache
Apache log4net |
Tue, 06 Oct 2026 20:00:00 +0000
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| 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. | |
| Title | Apache log4net: Unencodable content discards a whole SmtpPickupDirAppender batch | |
| Weaknesses | CWE-176 | |
| References |
| |
| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: apache
Published:
Updated: 2026-10-07T14:45:58.074Z
Reserved: 2026-10-04T16:20:44.036Z
Link: CVE-2026-105241
Updated: 2026-10-07T06:11:57.596Z
Status : Awaiting Analysis
Published: 2026-10-06T20:17:15.907
Modified: 2026-10-07T15:17:06.543
Link: CVE-2026-105241
No data.
OpenCVE Enrichment
Updated: 2026-10-07T01:00:09Z
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CWE-176
Improper Handling of Unicode Encoding