{
  "fix": "Mozilla Firefox (en-US) 149.0.2",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox-149.0.2",
  "summary": "Mozilla Firefox (en-US) 149.0.2, released April 7, 2026, fixes 4 CVEs in Mozilla Firefox (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every one of these CVEs.",
  "platform": "windows-app",
  "type": "app-version",
  "title": "Mozilla Firefox (en-US) 149.0.2",
  "released": "2026-04-07T00:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2026-5735, rated Critical",
  "supported": true,
  "cveCount": 4,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00364,
  "maxCvss": 9.8,
  "appliesTo": [
    {
      "product": "Mozilla Firefox (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-firefox-en-us",
      "fixedVersion": "149.0.2",
      "latestVersion": "159.0",
      "supported": true
    }
  ],
  "supersededBy": {
    "product": "Mozilla Firefox (en-US)",
    "latestVersion": "159.0",
    "productUrl": "https://patchblox.com/security/product/windows-app/mozilla-firefox-en-us"
  },
  "cves": [
    {
      "cveId": "CVE-2026-5735",
      "url": "https://patchblox.com/security/cve/CVE-2026-5735",
      "title": "Memory safety bugs fixed in Firefox 149.0.2 and Thunderbird 149.0.2",
      "priority": "Urgent",
      "cvss": 9.8,
      "epss": 0.00267,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-5732",
      "url": "https://patchblox.com/security/cve/CVE-2026-5732",
      "title": "Incorrect boundary conditions, integer overflow in the Graphics: Text component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00364,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-5734",
      "url": "https://patchblox.com/security/cve/CVE-2026-5734",
      "title": "Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2",
      "priority": "High",
      "severity": "important",
      "cvss": 9.8,
      "epss": 0.00342,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-5733",
      "url": "https://patchblox.com/security/cve/CVE-2026-5733",
      "title": "Incorrect boundary conditions in the Graphics: WebGPU component",
      "priority": "High",
      "cvss": 8.8,
      "epss": 0.00315,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}