{
  "fix": "Mozilla Thunderbird (en-US) 140.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird-140.0",
  "summary": "Mozilla Thunderbird (en-US) 140.0, released July 2, 2025, fixes 2 CVEs in Mozilla Thunderbird (en-US). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Thunderbird (en-US) is 159.0, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Mozilla Thunderbird (en-US) 140.0",
  "released": "2025-07-02T00:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2025-6436, high severity",
  "supported": true,
  "cveCount": 2,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.04256,
  "maxCvss": 8.1,
  "appliesTo": [
    {
      "product": "Mozilla Thunderbird (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-thunderbird-en-us",
      "fixedVersion": "140.0",
      "latestVersion": "159.0",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Mozilla Thunderbird (en-US)",
    "latestVersion": "159.0",
    "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-thunderbird-en-us"
  },
  "cves": [
    {
      "cveId": "CVE-2025-6436",
      "url": "https://patchblox.com/security/cve/CVE-2025-6436",
      "title": "Memory safety bugs fixed in Firefox 140 and Thunderbird 140",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.1,
      "epss": 0.04256,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-6435",
      "url": "https://patchblox.com/security/cve/CVE-2025-6435",
      "title": "Save as in Devtools could download files without sanitizing the extension",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.1,
      "epss": 0.00457,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-09T19:38:12Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}