{
  "fix": "Microsoft Edge Dev 140.0.3421.0",
  "url": "https://patchblox.com/security/fix/windows-app/microsoft.edge.dev-140.0.3421.0",
  "summary": "Microsoft Edge Dev 140.0.3421.0, released July 7, 2025, fixes 14 CVEs in Microsoft Edge Dev. None of them is reported as exploited. Patch Radar priority: Urgent. The latest Microsoft Edge Dev is 159.0.4393.0, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Microsoft Edge Dev 140.0.3421.0",
  "released": "2025-07-07T00:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2025-9478, rated Critical",
  "supported": true,
  "cveCount": 14,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.07419,
  "maxCvss": 9.6,
  "appliesTo": [
    {
      "product": "Microsoft Edge Dev",
      "productUrl": "https://patchblox.com/security/product/windows-app/microsoft-edge-dev",
      "fixedVersion": "140.0.3421.0",
      "latestVersion": "159.0.4393.0",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Microsoft Edge Dev",
    "latestVersion": "159.0.4393.0",
    "productUrl": "https://patchblox.com/security/product/windows-app/microsoft-edge-dev"
  },
  "cves": [
    {
      "cveId": "CVE-2025-9478",
      "url": "https://patchblox.com/security/cve/CVE-2025-9478",
      "title": "Chromium: CVE-2025-9478 Use after free in ANGLE",
      "priority": "Urgent",
      "severity": "CRITICAL",
      "cvss": 9.6,
      "epss": 0.07419,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8901",
      "url": "https://patchblox.com/security/cve/CVE-2025-8901",
      "title": "Chromium: CVE-2025-8901 Out of bounds write in ANGLE",
      "priority": "Urgent",
      "severity": "CRITICAL",
      "cvss": 9.6,
      "epss": 0.00335,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8578",
      "url": "https://patchblox.com/security/cve/CVE-2025-8578",
      "title": "Chromium: CVE-2025-8578 Use after free in Cast",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00358,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8576",
      "url": "https://patchblox.com/security/cve/CVE-2025-8576",
      "title": "Chromium: CVE-2025-8576 Use after free in Extensions",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00343,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8879",
      "url": "https://patchblox.com/security/cve/CVE-2025-8879",
      "title": "Chromium: CVE-2025-8879 Heap buffer overflow in libaom",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00295,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8880",
      "url": "https://patchblox.com/security/cve/CVE-2025-8880",
      "title": "Chromium: CVE-2025-8880 Race in V8",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00282,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8882",
      "url": "https://patchblox.com/security/cve/CVE-2025-8882",
      "title": "Chromium: CVE-2025-8882 Use after free in Aura",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00274,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8581",
      "url": "https://patchblox.com/security/cve/CVE-2025-8581",
      "title": "Chromium: CVE-2025-8581 Inappropriate implementation in Extensions",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.00298,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8577",
      "url": "https://patchblox.com/security/cve/CVE-2025-8577",
      "title": "Chromium: CVE-2025-8577 Inappropriate implementation in Picture In Picture",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.00261,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8579",
      "url": "https://patchblox.com/security/cve/CVE-2025-8579",
      "title": "Chromium: CVE-2025-8579 Inappropriate implementation in Gemini Live in Chrome",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.00261,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8580",
      "url": "https://patchblox.com/security/cve/CVE-2025-8580",
      "title": "Chromium: CVE-2025-8580 Inappropriate implementation in Filesystems",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.00261,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8582",
      "url": "https://patchblox.com/security/cve/CVE-2025-8582",
      "title": "Chromium: CVE-2025-8582 Insufficient validation of untrusted input in DOM",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.00258,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8881",
      "url": "https://patchblox.com/security/cve/CVE-2025-8881",
      "title": "Chromium: CVE-2025-8881 Inappropriate implementation in File Picker",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 6.5,
      "epss": 0.00256,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-8583",
      "url": "https://patchblox.com/security/cve/CVE-2025-8583",
      "title": "Chromium: CVE-2025-8583 Inappropriate implementation in Permissions",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.00242,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-11T13:47:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}