{"id":"CVE-2026-105242","published":"2026-10-06T20:17:16.037","lastModified":"2026-10-09T15:28:34.500","description":"Improper Handling of Exceptional Conditions vulnerability in the aspnet-request pattern converter of Apache log4net.\n\nReading request parameters triggers ASP.NET request validation, so a request carrying content such as markup made the layout throw and the appender discarded the whole event. A sender could suppress the log record of their own request. Only applications on ASP.NET for .NET Framework whose layout uses %aspnet-request are affected.\n\nThis issue affects Apache log4net: from 1.2.11 before 3.5.0.\n\nUsers are recommended to upgrade to version 3.5.0, which fixes the issue.","cvssScore":5.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cwes":["CWE-755"],"vendors":["apache"],"products":["log4net"],"references":[{"url":"https://github.com/apache/logging-log4net/commit/145203420c579a703008b4b723b6a080757f4964","tags":["Patch"]},{"url":"https://github.com/apache/logging-log4net/pull/316","tags":["Patch"]},{"url":"https://lists.apache.org/thread.html/zg6dbqm4ztm7j3c21nfsqj0yxm5yrpdx","tags":["Mailing List","Vendor Advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2026/10/07/16","tags":["Mailing List","Third Party Advisory"]}],"exploitRefs":[{"url":"https://github.com/apache/logging-log4net/commit/145203420c579a703008b4b723b6a080757f4964","tags":["Patch"]},{"url":"https://github.com/apache/logging-log4net/pull/316","tags":["Patch"]}],"hasPoc":true,"ai":null}