{
  "fix": "Mozilla Thunderbird ESR (da) 140.10.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.esr.da-140.10.0",
  "summary": "Mozilla Thunderbird ESR (da) 140.10.0, released April 21, 2026, fixes 25 CVEs in Mozilla Thunderbird ESR (da). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Thunderbird ESR (da) is 153.7.0, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Mozilla Thunderbird ESR (da) 140.10.0",
  "released": "2026-04-21T00:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2026-6770, high severity",
  "supported": true,
  "cveCount": 25,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.03883,
  "maxCvss": 9.8,
  "appliesTo": [
    {
      "product": "Mozilla Thunderbird ESR (da)",
      "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-thunderbird-esr-da",
      "fixedVersion": "140.10.0",
      "latestVersion": "153.7.0",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Mozilla Thunderbird ESR (da)",
    "latestVersion": "153.7.0",
    "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-thunderbird-esr-da"
  },
  "cves": [
    {
      "cveId": "CVE-2026-6770",
      "url": "https://patchblox.com/security/cve/CVE-2026-6770",
      "title": "Other issue in the Storage: IndexedDB component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.03883,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6746",
      "url": "https://patchblox.com/security/cve/CVE-2026-6746",
      "title": "Use-after-free in the DOM: Core \u0026 HTML component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00946,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6785",
      "url": "https://patchblox.com/security/cve/CVE-2026-6785",
      "title": "Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00513,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6786",
      "url": "https://patchblox.com/security/cve/CVE-2026-6786",
      "title": "Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00499,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6757",
      "url": "https://patchblox.com/security/cve/CVE-2026-6757",
      "title": "Invalid pointer in the JavaScript: WebAssembly component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00489,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6750",
      "url": "https://patchblox.com/security/cve/CVE-2026-6750",
      "title": "Privilege escalation in the Graphics: WebRender component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00483,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6749",
      "url": "https://patchblox.com/security/cve/CVE-2026-6749",
      "title": "Information disclosure due to uninitialized memory in the Graphics: Canvas2D component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00403,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6747",
      "url": "https://patchblox.com/security/cve/CVE-2026-6747",
      "title": "Use-after-free in the WebRTC component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.004,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6748",
      "url": "https://patchblox.com/security/cve/CVE-2026-6748",
      "title": "Uninitialized memory in the Audio/Video: Web Codecs component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 9.8,
      "epss": 0.00399,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6772",
      "url": "https://patchblox.com/security/cve/CVE-2026-6772",
      "title": "Incorrect boundary conditions in the Libraries component in NSS",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.0039,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6754",
      "url": "https://patchblox.com/security/cve/CVE-2026-6754",
      "title": "Use-after-free in the JavaScript Engine component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00387,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6759",
      "url": "https://patchblox.com/security/cve/CVE-2026-6759",
      "title": "Use-after-free in the Widget: Cocoa component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00363,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6771",
      "url": "https://patchblox.com/security/cve/CVE-2026-6771",
      "title": "Mitigation bypass in the DOM: Security component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 9.8,
      "epss": 0.00309,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6751",
      "url": "https://patchblox.com/security/cve/CVE-2026-6751",
      "title": "Uninitialized memory in the Audio/Video: Web Codecs component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00307,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6752",
      "url": "https://patchblox.com/security/cve/CVE-2026-6752",
      "title": "Incorrect boundary conditions in the WebRTC component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00306,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6753",
      "url": "https://patchblox.com/security/cve/CVE-2026-6753",
      "title": "Incorrect boundary conditions in the WebRTC component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00306,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6766",
      "url": "https://patchblox.com/security/cve/CVE-2026-6766",
      "title": "Incorrect boundary conditions in the Libraries component in NSS",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00257,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6764",
      "url": "https://patchblox.com/security/cve/CVE-2026-6764",
      "title": "Incorrect boundary conditions in the DOM: Device Interfaces component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00231,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6767",
      "url": "https://patchblox.com/security/cve/CVE-2026-6767",
      "title": "Other issue in the Libraries component in NSS",
      "priority": "High",
      "severity": "medium",
      "cvss": 8.8,
      "epss": 0.00227,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6769",
      "url": "https://patchblox.com/security/cve/CVE-2026-6769",
      "title": "Privilege escalation in the Debugger component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00226,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6761",
      "url": "https://patchblox.com/security/cve/CVE-2026-6761",
      "title": "Privilege escalation in the Networking component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00221,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6765",
      "url": "https://patchblox.com/security/cve/CVE-2026-6765",
      "title": "Information disclosure in the Form Autofill component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00215,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6763",
      "url": "https://patchblox.com/security/cve/CVE-2026-6763",
      "title": "Mitigation bypass in the File Handling component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00191,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6762",
      "url": "https://patchblox.com/security/cve/CVE-2026-6762",
      "title": "Spoofing issue in the DOM: Core \u0026 HTML component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.00187,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-6776",
      "url": "https://patchblox.com/security/cve/CVE-2026-6776",
      "title": "Incorrect boundary conditions in the WebRTC: Networking component",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 8.8,
      "epss": 0.0011,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-11T19:49:26Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}