{
  "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-2026-105240",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-105240",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-06T19:47:44.900Z",
    "updatedAt": "2026-10-07T16:27:16.989Z",
    "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: NUL character truncates OutputDebugStringAppender records",
      "summary": "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.",
      "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": "6046fe9d7f353b49fe995361c071ec2eea8f7ef6"
            }
          ]
        }
      ]
    }
  }
}