{"id":"CVE-2026-105242","revision":"2573c51966c648568b8329c1f161aa5a","records":[{"revision":"2573c51966c648568b8329c1f161aa5a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-105242","aliases":[],"title":"Apache log4net: Request validation failure drops the event in the aspnet-request converter","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.","state":0,"publishedAt":"2026-10-06T19:50:19.075+00:00","modifiedAt":"2026-10-07T14:49:06.441+00:00","affected":[{"ecosystem":"NuGet","name":"log4net","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Apache Software Foundation\",\n                    \"product\": \"Apache log4net\",\n                    \"packageURL\": \"pkg:nuget/log4net\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"1.2.11\",\n                            \"lessThan\": \"3.5.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"collectionURL\": \"https://nuget.org/packages\",\n                    \"packageName\": \"log4net\"\n                }"},{"ecosystem":"NuGet","name":"log4net","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Apache Software Foundation\",\n                    \"product\": \"Apache log4net\",\n                    \"packageURL\": \"pkg:nuget/log4net\",\n                    \"repo\": \"https://gitbox.apache.org/repos/asf/logging-log4net.git\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"243f1e9f3ee235955bade4b4fe664a903378719a\",\n                            \"lessThan\": \"145203420c579a703008b4b723b6a080757f4964\",\n                            \"versionType\": \"git\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"collectionURL\": \"https://nuget.org/packages\",\n                    \"packageName\": \"log4net\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/apache/logging-log4net/pull/316","https://github.com/apache/logging-log4net/commit/145203420c579a703008b4b723b6a080757f4964","https://lists.apache.org/thread.html/zg6dbqm4ztm7j3c21nfsqj0yxm5yrpdx"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-105242","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-105242","identifiers":["CVE-2026-105242"]},"retained":false,"historicalAffected":[]}],"coverage":[]}