{
  "fix": "Firefox Developer Edition (en-US) 140.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition-140.0",
  "summary": "Firefox Developer Edition (en-US) 140.0, released June 13, 2025, fixes 12 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) 140.0",
  "released": "2025-06-13T00:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2025-49710, rated Critical",
  "supported": true,
  "cveCount": 12,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.07964,
  "maxCvss": 9.8,
  "appliesTo": [
    {
      "product": "Firefox Developer Edition (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/firefox-developer-edition-en-us",
      "fixedVersion": "140.0",
      "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-2025-49710",
      "url": "https://patchblox.com/security/cve/CVE-2025-49710",
      "title": "Integer overflow in OrderedHashTable",
      "priority": "Urgent",
      "cvss": 9.8,
      "epss": 0.00748,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-49709",
      "url": "https://patchblox.com/security/cve/CVE-2025-49709",
      "title": "Memory corruption in canvas surfaces",
      "priority": "Urgent",
      "cvss": 9.8,
      "epss": 0.00666,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-6424",
      "url": "https://patchblox.com/security/cve/CVE-2025-6424",
      "title": "Use-after-free in FontFaceSet",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.07964,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-6436",
      "url": "https://patchblox.com/security/cve/CVE-2025-6436",
      "title": "Memory safety bugs fixed in Firefox 140 and Thunderbird 140",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.1,
      "epss": 0.04256,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-6435",
      "url": "https://patchblox.com/security/cve/CVE-2025-6435",
      "title": "Save as in Devtools could download files without sanitizing the extension",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.1,
      "epss": 0.00457,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-6427",
      "url": "https://patchblox.com/security/cve/CVE-2025-6427",
      "title": "connect-src Content Security Policy restriction could be bypassed",
      "priority": "High",
      "severity": "Medium",
      "cvss": 9.1,
      "epss": 0.00368,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-6429",
      "url": "https://patchblox.com/security/cve/CVE-2025-6429",
      "title": "Incorrect parsing of URLs could have allowed embedding of youtube.com",
      "priority": "High",
      "severity": "Medium",
      "cvss": 7.5,
      "epss": 0.00355,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-6432",
      "url": "https://patchblox.com/security/cve/CVE-2025-6432",
      "title": "DNS Requests leaked outside of a configured SOCKS proxy",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.6,
      "epss": 0.0035,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-6425",
      "url": "https://patchblox.com/security/cve/CVE-2025-6425",
      "title": "The WebCompat WebExtension shipped with Firefox exposed a persistent UUID",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.0031,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-6433",
      "url": "https://patchblox.com/security/cve/CVE-2025-6433",
      "title": "WebAuthn would allow a user to sign a challenge on a webpage with an invalid TLS certificate",
      "priority": "High",
      "severity": "Medium",
      "cvss": 9.8,
      "epss": 0.00297,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-6430",
      "url": "https://patchblox.com/security/cve/CVE-2025-6430",
      "title": "Content-Disposition header ignored when a file is included in an embed or object tag",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.00268,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-6434",
      "url": "https://patchblox.com/security/cve/CVE-2025-6434",
      "title": "HTTPS-Only exception screen lacked anti-clickjacking delay",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 4.3,
      "epss": 0.00283,
      "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"
  }
}