{
  "fix": "Firefox Developer Edition (en-US) 135.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition-135.0",
  "summary": "Firefox Developer Edition (en-US) 135.0, released January 24, 2025, fixes 13 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) 135.0",
  "released": "2025-01-24T00:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2025-1009, high severity",
  "supported": true,
  "cveCount": 13,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.01207,
  "maxCvss": 9.8,
  "appliesTo": [
    {
      "product": "Firefox Developer Edition (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/firefox-developer-edition-en-us",
      "fixedVersion": "135.0",
      "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-2025-1009",
      "url": "https://patchblox.com/security/cve/CVE-2025-1009",
      "title": "Use-after-free in XSLT",
      "priority": "High",
      "severity": "Medium",
      "cvss": 9.8,
      "epss": 0.01207,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-1011",
      "url": "https://patchblox.com/security/cve/CVE-2025-1011",
      "title": "A bug in WebAssembly code generation could result in a crash",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.8,
      "epss": 0.00633,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-1016",
      "url": "https://patchblox.com/security/cve/CVE-2025-1016",
      "title": "Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 115.20, and Thunderbird 128.7",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.00592,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-1017",
      "url": "https://patchblox.com/security/cve/CVE-2025-1017",
      "title": "Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.00579,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-1937",
      "url": "https://patchblox.com/security/cve/CVE-2025-1937",
      "title": "Memory safety bugs fixed in Firefox 136, Thunderbird 136, Firefox ESR 115.21, Firefox ESR 128.8, and Thunderbird 128.8",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.8,
      "epss": 0.00562,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-1020",
      "url": "https://patchblox.com/security/cve/CVE-2025-1020",
      "title": "Memory safety bugs fixed in Firefox 135 and Thunderbird 135",
      "priority": "High",
      "severity": "Medium",
      "cvss": 9.8,
      "epss": 0.0054,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-1010",
      "url": "https://patchblox.com/security/cve/CVE-2025-1010",
      "title": "Use-after-free in Custom Highlight",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.8,
      "epss": 0.00464,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-1012",
      "url": "https://patchblox.com/security/cve/CVE-2025-1012",
      "title": "Use-after-free during concurrent delazification",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.8,
      "epss": 0.00452,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-1014",
      "url": "https://patchblox.com/security/cve/CVE-2025-1014",
      "title": "Certificate length was not properly checked",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.8,
      "epss": 0.0039,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-1938",
      "url": "https://patchblox.com/security/cve/CVE-2025-1938",
      "title": "Memory safety bugs fixed in Firefox 136, Thunderbird 136, Firefox ESR 128.8, and Thunderbird 128.8",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00337,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-1013",
      "url": "https://patchblox.com/security/cve/CVE-2025-1013",
      "title": "Potential opening of private browsing tabs in normal browsing windows",
      "priority": "High",
      "severity": "Medium",
      "cvss": 8.8,
      "epss": 0.00325,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-1018",
      "url": "https://patchblox.com/security/cve/CVE-2025-1018",
      "title": "Fullscreen notification is not displayed when fullscreen is re-requested",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 5.3,
      "epss": 0.00416,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-1019",
      "url": "https://patchblox.com/security/cve/CVE-2025-1019",
      "title": "Fullscreen notification not properly displayed",
      "priority": "Routine",
      "severity": "Medium",
      "cvss": 4.3,
      "epss": 0.00362,
      "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"
  }
}