{
  "fix": "Microsoft Edge WebView2 Runtime 146.0.3856.84",
  "url": "https://patchblox.com/security/fix/windows-app/microsoft.edgewebview2runtime-146.0.3856.84",
  "summary": "Microsoft Edge WebView2 Runtime 146.0.3856.84, released March 26, 2026, fixes 8 CVEs in Microsoft Edge WebView2 Runtime. None of them is reported as exploited. Patch Radar priority: High. 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 146.0.3856.84",
  "released": "2026-03-26T00:00:00Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2026-4673, high severity",
  "supported": true,
  "cveCount": 8,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00513,
  "maxCvss": 8.8,
  "appliesTo": [
    {
      "product": "Microsoft Edge WebView2 Runtime",
      "productUrl": "https://patchblox.com/security/product/windows-app/microsoft-edge-webview2-runtime",
      "fixedVersion": "146.0.3856.84",
      "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-2026-4673",
      "url": "https://patchblox.com/security/cve/CVE-2026-4673",
      "title": "Chromium: CVE-2026-4673 Heap buffer overflow in WebAudio",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00513,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4674",
      "url": "https://patchblox.com/security/cve/CVE-2026-4674",
      "title": "Chromium: CVE-2026-4674 Out of bounds read in CSS",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00462,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4677",
      "url": "https://patchblox.com/security/cve/CVE-2026-4677",
      "title": "Chromium: CVE-2026-4677 Out of bounds read in WebAudio",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00455,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4680",
      "url": "https://patchblox.com/security/cve/CVE-2026-4680",
      "title": "Chromium: CVE-2026-4680 Use after free in FedCM",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00428,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4678",
      "url": "https://patchblox.com/security/cve/CVE-2026-4678",
      "title": "Chromium: CVE-2026-4678 Use after free in WebGPU",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00404,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4675",
      "url": "https://patchblox.com/security/cve/CVE-2026-4675",
      "title": "Chromium: CVE-2026-4675 Heap buffer overflow in WebGL",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00392,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4676",
      "url": "https://patchblox.com/security/cve/CVE-2026-4676",
      "title": "Chromium: CVE-2026-4676 Use after free in Dawn",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00365,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4679",
      "url": "https://patchblox.com/security/cve/CVE-2026-4679",
      "title": "Chromium: CVE-2026-4679 Integer overflow in Fonts",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00346,
      "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"
  }
}