{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-105243",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-105243",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-06T19:51:25.116Z",
    "updatedAt": "2026-10-07T14:49:41.976Z",
    "importedAt": "2026-10-24T01:57:50.502Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Apache log4net: Oversize EventLogAppender record silently discarded",
      "summary": "Insufficient Logging vulnerability in the EventLogAppender of Apache log4net.\n\nLong messages were truncated to a fixed size that exceeds what the Windows Event Log accepts once the log and source names are counted, and the event log then stored nothing and reported nothing. A party whose data reaches a log message could suppress the whole record by making it long enough. Only applications on Windows that use EventLogAppender 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.",
      "affected": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache log4net",
          "packageName": "log4net",
          "collectionURL": "https://nuget.org/packages",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "1.2.9",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.5.0"
            }
          ]
        },
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache log4net",
          "packageName": "log4net",
          "collectionURL": "https://nuget.org/packages",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "02e1e115435888485f2e28b414d267e39e799e07",
              "status": "affected",
              "versionType": "git",
              "lessThan": "28fbfb25678c48a8cc5bc9b94ead0dddfc39ffed"
            }
          ]
        }
      ]
    }
  }
}