CVE-2026-105241
MEDIUM
5,3
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: none
Description
AI Translation Available
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.
176
Improper Handling of Unicode Encoding
DraftCommon Consequences
Security Scopes Affected:
Integrity
Potential Impacts:
Unexpected State
Applicable Platforms
All platforms may be affected
https://github.com/apache/logging-log4net/commit/4d2e10f0908199604b4326f9df6d0b…
https://github.com/apache/logging-log4net/pull/315
https://lists.apache.org/thread.html/hg8dgh3oy8bp3dhb8nsygk9kw2o401ws