{
  "fix": "Mozilla Thunderbird (en-US) 139.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird-139.0",
  "summary": "Mozilla Thunderbird (en-US) 139.0, released May 27, 2025, fixes 3 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) 139.0",
  "released": "2025-05-27T00:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2025-5268, high severity",
  "supported": true,
  "cveCount": 3,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.0051,
  "maxCvss": 8.8,
  "appliesTo": [
    {
      "product": "Mozilla Thunderbird (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-thunderbird-en-us",
      "fixedVersion": "139.0",
      "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-2025-5268",
      "url": "https://patchblox.com/security/cve/CVE-2025-5268",
      "title": "Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderbird 128.11",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.0051,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-5262",
      "url": "https://patchblox.com/security/cve/CVE-2025-5262",
      "title": "Mozilla Thunderbird ESR and 2 others: Double Free",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00464,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-5272",
      "url": "https://patchblox.com/security/cve/CVE-2025-5272",
      "title": "Memory safety bugs fixed in Firefox 139 and Thunderbird 139",
      "priority": "High",
      "severity": "Medium",
      "cvss": 7.3,
      "epss": 0.0034,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}