{
  "fix": "Microsoft Edge WebView2 Runtime 146.0.3856.72",
  "url": "https://patchblox.com/security/fix/windows-app/microsoft.edgewebview2runtime-146.0.3856.72",
  "summary": "Microsoft Edge WebView2 Runtime 146.0.3856.72, released March 20, 2026, fixes 24 CVEs in Microsoft Edge WebView2 Runtime. None of them is reported as exploited. Patch Radar priority: Urgent. The latest Microsoft Edge WebView2 Runtime is 157.0.4341.42, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Microsoft Edge WebView2 Runtime 146.0.3856.72",
  "released": "2026-03-20T00:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2026-4448, rated Critical",
  "supported": true,
  "cveCount": 24,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00431,
  "maxCvss": 9.6,
  "appliesTo": [
    {
      "product": "Microsoft Edge WebView2 Runtime",
      "productUrl": "https://patchblox.com/security/product/windows-app/microsoft-edge-webview2-runtime",
      "fixedVersion": "146.0.3856.72",
      "latestVersion": "157.0.4341.42",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Microsoft Edge WebView2 Runtime",
    "latestVersion": "157.0.4341.42",
    "productUrl": "https://patchblox.com/security/product/windows-app/microsoft-edge-webview2-runtime"
  },
  "cves": [
    {
      "cveId": "CVE-2026-4448",
      "url": "https://patchblox.com/security/cve/CVE-2026-4448",
      "title": "Chromium: CVE-2026-4448 Heap buffer overflow in ANGLE",
      "priority": "Urgent",
      "severity": "CRITICAL",
      "cvss": 9.6,
      "epss": 0.00297,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4460",
      "url": "https://patchblox.com/security/cve/CVE-2026-4460",
      "title": "Chromium: CVE-2026-4460 Out of bounds read in Skia",
      "priority": "Urgent",
      "severity": "CRITICAL",
      "cvss": 9.6,
      "epss": 0.00277,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4464",
      "url": "https://patchblox.com/security/cve/CVE-2026-4464",
      "title": "Chromium: CVE-2026-4464 Integer overflow in ANGLE",
      "priority": "Urgent",
      "severity": "CRITICAL",
      "cvss": 9.6,
      "epss": 0.00277,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4452",
      "url": "https://patchblox.com/security/cve/CVE-2026-4452",
      "title": "Chromium: CVE-2026-4452 Integer overflow in ANGLE",
      "priority": "Urgent",
      "severity": "CRITICAL",
      "cvss": 9.6,
      "epss": 0.00262,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4443",
      "url": "https://patchblox.com/security/cve/CVE-2026-4443",
      "title": "Chromium: CVE-2026-4443 Heap buffer overflow in WebAudio",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00431,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4447",
      "url": "https://patchblox.com/security/cve/CVE-2026-4447",
      "title": "Chromium: CVE-2026-4447 Inappropriate implementation in V8",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00368,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4457",
      "url": "https://patchblox.com/security/cve/CVE-2026-4457",
      "title": "Chromium: CVE-2026-4457 Type Confusion in V8",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00365,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4440",
      "url": "https://patchblox.com/security/cve/CVE-2026-4440",
      "title": "Chromium: CVE-2026-4440 Out of bounds read and write in WebGL",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00336,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4461",
      "url": "https://patchblox.com/security/cve/CVE-2026-4461",
      "title": "Chromium: CVE-2026-4461 Inappropriate implementation in V8",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00334,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4441",
      "url": "https://patchblox.com/security/cve/CVE-2026-4441",
      "title": "Chromium: CVE-2026-4441 Use after free in Base",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.0033,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4463",
      "url": "https://patchblox.com/security/cve/CVE-2026-4463",
      "title": "Chromium: CVE-2026-4463 Heap buffer overflow in WebRTC",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00313,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4444",
      "url": "https://patchblox.com/security/cve/CVE-2026-4444",
      "title": "Chromium: CVE-2026-4444 Stack buffer overflow in WebRTC",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00301,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4446",
      "url": "https://patchblox.com/security/cve/CVE-2026-4446",
      "title": "Chromium: CVE-2026-4446 Use after free in WebRTC",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00292,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4450",
      "url": "https://patchblox.com/security/cve/CVE-2026-4450",
      "title": "Chromium: CVE-2026-4450 Out of bounds write in V8",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00292,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4459",
      "url": "https://patchblox.com/security/cve/CVE-2026-4459",
      "title": "Chromium: CVE-2026-4459 Out of bounds read and write in WebAudio",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00292,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4442",
      "url": "https://patchblox.com/security/cve/CVE-2026-4442",
      "title": "Chromium: CVE-2026-4442 Heap buffer overflow in CSS",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00282,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4445",
      "url": "https://patchblox.com/security/cve/CVE-2026-4445",
      "title": "Chromium: CVE-2026-4445 Use after free in WebRTC",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00262,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4449",
      "url": "https://patchblox.com/security/cve/CVE-2026-4449",
      "title": "Chromium: CVE-2026-4449 Use after free in Blink",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00262,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4451",
      "url": "https://patchblox.com/security/cve/CVE-2026-4451",
      "title": "Chromium: CVE-2026-4451 Insufficient validation of untrusted input in Navigation",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00262,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4454",
      "url": "https://patchblox.com/security/cve/CVE-2026-4454",
      "title": "Chromium: CVE-2026-4454 Use after free in Network",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00262,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4456",
      "url": "https://patchblox.com/security/cve/CVE-2026-4456",
      "title": "Chromium: CVE-2026-4456 Use after free in Digital Credentials API",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00262,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4462",
      "url": "https://patchblox.com/security/cve/CVE-2026-4462",
      "title": "Chromium: CVE-2026-4462 Out of bounds read in Blink",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00262,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4455",
      "url": "https://patchblox.com/security/cve/CVE-2026-4455",
      "title": "Chromium: CVE-2026-4455 Heap buffer overflow in PDFium",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.0026,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4458",
      "url": "https://patchblox.com/security/cve/CVE-2026-4458",
      "title": "Chromium: CVE-2026-4458 Use after free in Extensions",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.002,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-11T07:45:43Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}