{
  "fix": "Firefox Developer Edition (en-US) 134.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition-134.0",
  "summary": "Firefox Developer Edition (en-US) 134.0, released December 13, 2024, fixes 9 CVEs in Firefox Developer Edition (en-US). None of them is reported as exploited. Patch Radar priority: High. 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) 134.0",
  "released": "2024-12-13T00:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2025-0242, high severity",
  "supported": true,
  "cveCount": 9,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.14716,
  "maxCvss": 9.8,
  "appliesTo": [
    {
      "product": "Firefox Developer Edition (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/firefox-developer-edition-en-us",
      "fixedVersion": "134.0",
      "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-2025-0242",
      "url": "https://patchblox.com/security/cve/CVE-2025-0242",
      "title": "Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19, Firefox ESR 128.6, Thunderbird 115.19, and Thunderbird 128.6",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.14716,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-0247",
      "url": "https://patchblox.com/security/cve/CVE-2025-0247",
      "title": "Memory safety bugs fixed in Firefox 134 and Thunderbird 134",
      "priority": "High",
      "severity": "Medium",
      "cvss": 9.8,
      "epss": 0.10609,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-0241",
      "url": "https://patchblox.com/security/cve/CVE-2025-0241",
      "title": "Memory corruption when using JavaScript Text Segmentation",
      "priority": "High",
      "severity": "Medium",
      "cvss": 7.7,
      "epss": 0.00734,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-0244",
      "url": "https://patchblox.com/security/cve/CVE-2025-0244",
      "title": "Address bar spoofing using an invalid protocol scheme on Firefox for Android",
      "priority": "Routine",
      "cvss": 5.3,
      "epss": 0.07391,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-0238",
      "url": "https://patchblox.com/security/cve/CVE-2025-0238",
      "title": "Use-after-free when breaking lines in text",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 6.5,
      "epss": 0.00794,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-0240",
      "url": "https://patchblox.com/security/cve/CVE-2025-0240",
      "title": "Compartment mismatch when parsing JavaScript JSON module",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 6.5,
      "epss": 0.00673,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-0237",
      "url": "https://patchblox.com/security/cve/CVE-2025-0237",
      "title": "WebChannel APIs susceptible to confused deputy attack",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 6.8,
      "epss": 0.00598,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-0245",
      "url": "https://patchblox.com/security/cve/CVE-2025-0245",
      "title": "Lock screen setting bypass in Firefox Focus for Android",
      "priority": "Routine",
      "cvss": 3.3,
      "epss": 0.00288,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-0239",
      "url": "https://patchblox.com/security/cve/CVE-2025-0239",
      "title": "Alt-Svc ALPN validation failure when redirected",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 5.4,
      "epss": 0.00227,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}