{"id":"CVE-2026-105240","revision":null,"records":[{"revision":"f3e2903012dc40f68c6df99e88694884","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-105240","aliases":[],"title":"Apache log4net: NUL character truncates OutputDebugStringAppender records","description":"Improper Neutralization of Null Byte or NUL Character vulnerability in the OutputDebugStringAppender of Apache log4net.\n\nA NUL character in logged content ended the debug output record at that point, so everything the layout rendered after it, including exception text and trailing fields, was silently lost. A party whose data reaches a log message could hide the rest of that record. Only applications on Windows that use OutputDebugStringAppender are affected.\n\nThis issue affects Apache log4net: from 1.2.9 before 3.5.0.\n\nUsers are recommended to upgrade to version 3.5.0, which fixes the issue.","state":0,"publishedAt":"2026-10-06T19:47:44.9+00:00","modifiedAt":"2026-10-07T16:27:16.989+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\": \"1.2.9\",\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\": \"02e1e115435888485f2e28b414d267e39e799e07\",\n                            \"lessThan\": \"6046fe9d7f353b49fe995361c071ec2eea8f7ef6\",\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/315","https://github.com/apache/logging-log4net/commit/6046fe9d7f353b49fe995361c071ec2eea8f7ef6","https://lists.apache.org/thread.html/gyw2d4ppy82t1vlpdknkfd1nmzp21z17"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-105240","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-105240","identifiers":["CVE-2026-105240"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-99bdca71b3604150bbac354a4a9d8a89","complete":false,"records":13758,"lastAttemptAt":"2026-11-11T12:09:48.959833+00:00","lastSuccessAt":"2026-11-11T12:09:48.955+00:00","error":null,"lastVerifiedAt":"2026-11-11T12:09:48.955+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13489,"expectedIdentifiers":13812,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-11T11:57:48.1935565+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-11T11:57:48.1935565+00:00","lastSuccessAt":"2026-11-11T11:57:48.3433334+00:00","error":null,"lastVerifiedAt":"2026-11-11T11:57:48.3433335+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-622dd4c770014d0cabbdd0941fabd46f","complete":true,"records":13752,"lastAttemptAt":"2026-11-11T11:57:48.9429139+00:00","lastSuccessAt":"2026-11-11T10:57:38.856+00:00","error":null,"lastVerifiedAt":"2026-11-11T10:57:38.856+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13812,"expectedIdentifiers":13812,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-3562b6c78fd1bd0f0b55daf66a0926ae24f65e462df7f6d928caad458fc696bf","complete":true,"records":9947,"lastAttemptAt":"2026-11-11T11:57:47.7728063+00:00","lastSuccessAt":"2026-11-11T04:27:43.6877707+00:00","error":null,"lastVerifiedAt":"2026-11-11T11:57:47.7728063+00:00","snapshotPublishedAt":"2026-11-11T03:32:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-456002455e0ab94bb92c95476d4e6d175c104cd594749982afd96c893728ecbc","complete":true,"records":2010,"lastAttemptAt":"2026-11-11T11:57:47.2778993+00:00","lastSuccessAt":"2026-11-11T02:36:58.1276999+00:00","error":null,"lastVerifiedAt":"2026-11-11T11:57:47.2778993+00:00","snapshotPublishedAt":"2026-11-11T01:17:51+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-b178858a6ba5f2e20262964fa29d9573839d1b8b735abe524cc7d061ebde5c37","complete":true,"records":3088,"lastAttemptAt":"2026-11-11T11:57:48.1551807+00:00","lastSuccessAt":"2026-11-11T10:57:37.4490966+00:00","error":null,"lastVerifiedAt":"2026-11-11T11:57:48.1551807+00:00","snapshotPublishedAt":"2026-11-11T10:48:28+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-085e065fc9050ae18408f7e722c39653aeb186872334d7b3ec1fcafb7ed43d25","complete":true,"records":231665,"lastAttemptAt":"2026-11-11T11:57:47.665155+00:00","lastSuccessAt":"2026-11-11T08:27:45.2700102+00:00","error":null,"lastVerifiedAt":"2026-11-11T11:57:47.665155+00:00","snapshotPublishedAt":"2026-11-11T07:32:59+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}