{
  "fix": "Mozilla Firefox (en-US) 147.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox-147.0",
  "summary": "Mozilla Firefox (en-US) 147.0, released January 13, 2026, fixes 16 CVEs in Mozilla Firefox (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Mozilla Firefox (en-US) 147.0",
  "released": "2026-01-13T00:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2026-0892, rated Critical",
  "supported": true,
  "cveCount": 16,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00543,
  "maxCvss": 10,
  "appliesTo": [
    {
      "product": "Mozilla Firefox (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-firefox-en-us",
      "fixedVersion": "147.0",
      "latestVersion": "159.0",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Mozilla Firefox (en-US)",
    "latestVersion": "159.0",
    "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-firefox-en-us"
  },
  "cves": [
    {
      "cveId": "CVE-2026-0892",
      "url": "https://patchblox.com/security/cve/CVE-2026-0892",
      "title": "Memory safety bugs fixed in Firefox 147 and Thunderbird 147",
      "priority": "Urgent",
      "cvss": 9.8,
      "epss": 0.00448,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0881",
      "url": "https://patchblox.com/security/cve/CVE-2026-0881",
      "title": "Sandbox escape in the Messaging System component",
      "priority": "Urgent",
      "cvss": 10,
      "epss": 0.00348,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0880",
      "url": "https://patchblox.com/security/cve/CVE-2026-0880",
      "title": "Sandbox escape due to integer overflow in the Graphics component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00543,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0879",
      "url": "https://patchblox.com/security/cve/CVE-2026-0879",
      "title": "Sandbox escape due to incorrect boundary conditions in the Graphics component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.005,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0891",
      "url": "https://patchblox.com/security/cve/CVE-2026-0891",
      "title": "Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.1,
      "epss": 0.00475,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0877",
      "url": "https://patchblox.com/security/cve/CVE-2026-0877",
      "title": "Mitigation bypass in the DOM: Security component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.1,
      "epss": 0.00473,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0878",
      "url": "https://patchblox.com/security/cve/CVE-2026-0878",
      "title": "Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8,
      "epss": 0.00469,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0882",
      "url": "https://patchblox.com/security/cve/CVE-2026-0882",
      "title": "Use-after-free in the IPC component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00465,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0884",
      "url": "https://patchblox.com/security/cve/CVE-2026-0884",
      "title": "Use-after-free in the JavaScript Engine component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.00463,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0889",
      "url": "https://patchblox.com/security/cve/CVE-2026-0889",
      "title": "Denial-of-service in the DOM: Service Workers component",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00459,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0885",
      "url": "https://patchblox.com/security/cve/CVE-2026-0885",
      "title": "Use-after-free in the JavaScript: GC component",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.00404,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0886",
      "url": "https://patchblox.com/security/cve/CVE-2026-0886",
      "title": "Incorrect boundary conditions in the Graphics component",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.00383,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0883",
      "url": "https://patchblox.com/security/cve/CVE-2026-0883",
      "title": "Information disclosure in the Networking component",
      "priority": "High",
      "severity": "Medium",
      "cvss": 7.5,
      "epss": 0.00355,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0887",
      "url": "https://patchblox.com/security/cve/CVE-2026-0887",
      "title": "Clickjacking issue, information disclosure in the PDF Viewer component",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.00326,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0890",
      "url": "https://patchblox.com/security/cve/CVE-2026-0890",
      "title": "Spoofing issue in the DOM: Copy \u0026 Paste and Drag \u0026 Drop component",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.003,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-0888",
      "url": "https://patchblox.com/security/cve/CVE-2026-0888",
      "title": "Information disclosure in the XML component",
      "priority": "Routine",
      "cvss": 5.3,
      "epss": 0.00347,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}