{
  "fix": "Firefox Developer Edition (en-US) 142.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition-142.0",
  "summary": "Firefox Developer Edition (en-US) 142.0, released August 8, 2025, fixes 9 CVEs in Firefox Developer Edition (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Firefox Developer Edition (en-US) 142.0",
  "released": "2025-08-08T00:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2025-9187, rated Critical",
  "supported": true,
  "cveCount": 9,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00612,
  "maxCvss": 9.8,
  "appliesTo": [
    {
      "product": "Firefox Developer Edition (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/firefox-developer-edition-en-us",
      "fixedVersion": "142.0",
      "latestVersion": "156.0",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Firefox Developer Edition (en-US)",
    "latestVersion": "156.0",
    "productUrl": "https://patchblox.com/security/product/windows-app/firefox-developer-edition-en-us"
  },
  "cves": [
    {
      "cveId": "CVE-2025-9187",
      "url": "https://patchblox.com/security/cve/CVE-2025-9187",
      "title": "Memory safety bugs fixed in Firefox 142 and Thunderbird 142",
      "priority": "Urgent",
      "cvss": 9.8,
      "epss": 0.0049,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-9179",
      "url": "https://patchblox.com/security/cve/CVE-2025-9179",
      "title": "Sandbox escape due to invalid pointer in the Audio/Video: GMP component",
      "priority": "High",
      "severity": "Medium",
      "cvss": 9.8,
      "epss": 0.00612,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-9185",
      "url": "https://patchblox.com/security/cve/CVE-2025-9185",
      "title": "Memory safety bugs fixed in Firefox ESR 115.27, Firefox ESR 128.14, Thunderbird ESR 128.14, Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.1,
      "epss": 0.00509,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-9182",
      "url": "https://patchblox.com/security/cve/CVE-2025-9182",
      "title": "Denial-of-service due to out-of-memory in the Graphics: WebRender component",
      "priority": "High",
      "severity": "Medium",
      "cvss": 7.5,
      "epss": 0.00411,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-9184",
      "url": "https://patchblox.com/security/cve/CVE-2025-9184",
      "title": "Memory safety bugs fixed in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.1,
      "epss": 0.00396,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-9181",
      "url": "https://patchblox.com/security/cve/CVE-2025-9181",
      "title": "Uninitialized memory in the JavaScript Engine component",
      "priority": "High",
      "severity": "Medium",
      "cvss": 7.5,
      "epss": 0.00389,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-9180",
      "url": "https://patchblox.com/security/cve/CVE-2025-9180",
      "title": "Same-origin policy bypass in the Graphics: Canvas2D component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.1,
      "epss": 0.00267,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-9183",
      "url": "https://patchblox.com/security/cve/CVE-2025-9183",
      "title": "Spoofing issue in the Address Bar component",
      "priority": "Routine",
      "severity": "important",
      "cvss": 6.5,
      "epss": 0.0027,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-9186",
      "url": "https://patchblox.com/security/cve/CVE-2025-9186",
      "title": "Spoofing issue in the Address Bar component of Firefox Focus for Android",
      "priority": "Routine",
      "cvss": 6.5,
      "epss": 0.00221,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}