{"schema":"threatline.record/2","record":{"id":"CVE-2026-105242","aliases":[],"summary":"Apache log4net: Request validation failure drops the event in the aspnet-request converter","details":"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.","categories":["Unclassified"],"product":"Apache log4net","vendor":"Apache Software Foundation","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-105242","source_modified_at":"2026-10-07T14:49:06.441Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"Apache log4net","vendor":"Apache Software Foundation","versions":[{"status":"affected","version":"1.2.11","lessThan":"3.5.0","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-105242","source_modified_at":"2026-10-07T14:49:06.441Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"Apache log4net","vendor":"Apache Software Foundation","versions":[{"status":"affected","version":"243f1e9f3ee235955bade4b4fe664a903378719a","lessThan":"145203420c579a703008b4b723b6a080757f4964","versionType":"git"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-105242","source_modified_at":"2026-10-07T14:49:06.441Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"Apache log4net","ecosystem":null},"version":"3.5.0","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-105242","source_modified_at":"2026-10-07T14:49:06.441Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"Apache log4net","ecosystem":null},"version":"145203420c579a703008b4b723b6a080757f4964","basis":"first unaffected version stated in the CVE record"}],"cvss":5.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00823,"percentile":0.56947,"score_date":"2026-10-23"},"published_at":"2026-10-06T19:50:19.075Z","modified_at":"2026-10-07T14:49:06.441Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-105242","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-07T14:49:06.441Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-105242","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/apache/logging-log4net/pull/316","tags":["patch"]},{"source":"CVE List","url":"https://github.com/apache/logging-log4net/commit/145203420c579a703008b4b723b6a080757f4964","tags":["patch"]},{"source":"CVE List","url":"https://lists.apache.org/thread.html/zg6dbqm4ztm7j3c21nfsqj0yxm5yrpdx","tags":["vendor-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-07T14:48:50.404406Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-07T14:49:06.441Z","content_hash":"3eba2db0a37996e6d25fb22dd12ac7f9f45365f3719ee7e477180b5db99ac4cf"}}