{
  "fix": "Firefox Developer Edition (en-US) 149.0",
  "url": "https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition-149.0",
  "summary": "Firefox Developer Edition (en-US) 149.0, released March 13, 2026, fixes 47 CVEs in Firefox Developer Edition (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. 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) 149.0",
  "released": "2026-03-13T00:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2026-4723, rated Critical",
  "supported": true,
  "cveCount": 47,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00967,
  "maxCvss": 10,
  "appliesTo": [
    {
      "product": "Firefox Developer Edition (en-US)",
      "productUrl": "https://patchblox.com/security/product/windows-app/firefox-developer-edition-en-us",
      "fixedVersion": "149.0",
      "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-2026-4723",
      "url": "https://patchblox.com/security/cve/CVE-2026-4723",
      "title": "Use-after-free in the JavaScript Engine component",
      "priority": "Urgent",
      "cvss": 9.8,
      "epss": 0.00617,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4724",
      "url": "https://patchblox.com/security/cve/CVE-2026-4724",
      "title": "Undefined behavior in the Audio/Video component",
      "priority": "Urgent",
      "cvss": 9.1,
      "epss": 0.00507,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4729",
      "url": "https://patchblox.com/security/cve/CVE-2026-4729",
      "title": "Memory safety bugs fixed in Firefox 149 and Thunderbird 149",
      "priority": "Urgent",
      "cvss": 9.8,
      "epss": 0.00343,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4725",
      "url": "https://patchblox.com/security/cve/CVE-2026-4725",
      "title": "Sandbox escape due to use-after-free in the Graphics: Canvas2D component",
      "priority": "Urgent",
      "cvss": 10,
      "epss": 0.00331,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4696",
      "url": "https://patchblox.com/security/cve/CVE-2026-4696",
      "title": "Use-after-free in the Layout: Text and Fonts component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.00967,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4700",
      "url": "https://patchblox.com/security/cve/CVE-2026-4700",
      "title": "Mitigation bypass in the Networking: HTTP component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.00918,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4690",
      "url": "https://patchblox.com/security/cve/CVE-2026-4690",
      "title": "Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.6,
      "epss": 0.00803,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4694",
      "url": "https://patchblox.com/security/cve/CVE-2026-4694",
      "title": "Incorrect boundary conditions, integer overflow in the Graphics component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.00803,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4698",
      "url": "https://patchblox.com/security/cve/CVE-2026-4698",
      "title": "JIT miscompilation in the JavaScript Engine: JIT component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.00785,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4686",
      "url": "https://patchblox.com/security/cve/CVE-2026-4686",
      "title": "Incorrect boundary conditions in the Graphics: Canvas2D component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.00729,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4685",
      "url": "https://patchblox.com/security/cve/CVE-2026-4685",
      "title": "Incorrect boundary conditions in the Graphics: Canvas2D component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.00714,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4693",
      "url": "https://patchblox.com/security/cve/CVE-2026-4693",
      "title": "Incorrect boundary conditions in the Audio/Video: Playback component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.00714,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4695",
      "url": "https://patchblox.com/security/cve/CVE-2026-4695",
      "title": "Incorrect boundary conditions in the Audio/Video: Web Codecs component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.00714,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4697",
      "url": "https://patchblox.com/security/cve/CVE-2026-4697",
      "title": "Incorrect boundary conditions in the Audio/Video: Web Codecs component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.00714,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4699",
      "url": "https://patchblox.com/security/cve/CVE-2026-4699",
      "title": "Incorrect boundary conditions in the Layout: Text and Fonts component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.00714,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4702",
      "url": "https://patchblox.com/security/cve/CVE-2026-4702",
      "title": "JIT miscompilation in the JavaScript Engine component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.007,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4689",
      "url": "https://patchblox.com/security/cve/CVE-2026-4689",
      "title": "Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component",
      "priority": "High",
      "severity": "Important",
      "cvss": 10,
      "epss": 0.00691,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4705",
      "url": "https://patchblox.com/security/cve/CVE-2026-4705",
      "title": "Undefined behavior in the WebRTC: Signaling component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.00656,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4704",
      "url": "https://patchblox.com/security/cve/CVE-2026-4704",
      "title": "Denial-of-service in the WebRTC: Signaling component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.00651,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4707",
      "url": "https://patchblox.com/security/cve/CVE-2026-4707",
      "title": "Incorrect boundary conditions in the Graphics: Canvas2D component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.006,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4687",
      "url": "https://patchblox.com/security/cve/CVE-2026-4687",
      "title": "Sandbox escape due to incorrect boundary conditions in the Telemetry component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.6,
      "epss": 0.0056,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4688",
      "url": "https://patchblox.com/security/cve/CVE-2026-4688",
      "title": "Sandbox escape due to use-after-free in the Disability Access APIs component",
      "priority": "High",
      "severity": "Important",
      "cvss": 10,
      "epss": 0.00552,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4726",
      "url": "https://patchblox.com/security/cve/CVE-2026-4726",
      "title": "Denial-of-service in the XML component",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00551,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4727",
      "url": "https://patchblox.com/security/cve/CVE-2026-4727",
      "title": "Denial-of-service in the Libraries component in NSS",
      "priority": "High",
      "cvss": 7.5,
      "epss": 0.00551,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4692",
      "url": "https://patchblox.com/security/cve/CVE-2026-4692",
      "title": "Sandbox escape in the Responsive Design Mode component",
      "priority": "High",
      "severity": "Important",
      "cvss": 10,
      "epss": 0.00506,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4691",
      "url": "https://patchblox.com/security/cve/CVE-2026-4691",
      "title": "Use-after-free in the CSS Parsing and Computation component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.00502,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4709",
      "url": "https://patchblox.com/security/cve/CVE-2026-4709",
      "title": "Incorrect boundary conditions in the Audio/Video: GMP component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.00481,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4718",
      "url": "https://patchblox.com/security/cve/CVE-2026-4718",
      "title": "Undefined behavior in the WebRTC: Signaling component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.00481,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4701",
      "url": "https://patchblox.com/security/cve/CVE-2026-4701",
      "title": "Use-after-free in the JavaScript Engine component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.00478,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4706",
      "url": "https://patchblox.com/security/cve/CVE-2026-4706",
      "title": "Incorrect boundary conditions in the Graphics: Canvas2D component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.0047,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4708",
      "url": "https://patchblox.com/security/cve/CVE-2026-4708",
      "title": "Incorrect boundary conditions in the Graphics component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.0045,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4713",
      "url": "https://patchblox.com/security/cve/CVE-2026-4713",
      "title": "Incorrect boundary conditions in the Graphics component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.0045,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4714",
      "url": "https://patchblox.com/security/cve/CVE-2026-4714",
      "title": "Incorrect boundary conditions in the Audio/Video component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.0045,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4719",
      "url": "https://patchblox.com/security/cve/CVE-2026-4719",
      "title": "Incorrect boundary conditions in the Graphics: Text component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.0045,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4715",
      "url": "https://patchblox.com/security/cve/CVE-2026-4715",
      "title": "Uninitialized memory in the Graphics: Canvas2D component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.1,
      "epss": 0.00447,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4720",
      "url": "https://patchblox.com/security/cve/CVE-2026-4720",
      "title": "Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.0044,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4721",
      "url": "https://patchblox.com/security/cve/CVE-2026-4721",
      "title": "Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.0044,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4717",
      "url": "https://patchblox.com/security/cve/CVE-2026-4717",
      "title": "Privilege escalation in the Netmonitor component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.00434,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4710",
      "url": "https://patchblox.com/security/cve/CVE-2026-4710",
      "title": "Incorrect boundary conditions in the Audio/Video component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.00425,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4716",
      "url": "https://patchblox.com/security/cve/CVE-2026-4716",
      "title": "Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.1,
      "epss": 0.00423,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4711",
      "url": "https://patchblox.com/security/cve/CVE-2026-4711",
      "title": "Use-after-free in the Widget: Cocoa component",
      "priority": "High",
      "severity": "Important",
      "cvss": 9.8,
      "epss": 0.00413,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4712",
      "url": "https://patchblox.com/security/cve/CVE-2026-4712",
      "title": "Information disclosure in the Widget: Cocoa component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.004,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4684",
      "url": "https://patchblox.com/security/cve/CVE-2026-4684",
      "title": "Race condition, use-after-free in the Graphics: WebRender component",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.2,
      "epss": 0.00366,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-3847",
      "url": "https://patchblox.com/security/cve/CVE-2026-3847",
      "title": "Memory safety bugs fixed in Firefox 148.0.2",
      "priority": "High",
      "cvss": 8.8,
      "epss": 0.00359,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4722",
      "url": "https://patchblox.com/security/cve/CVE-2026-4722",
      "title": "Privilege escalation in the IPC component",
      "priority": "High",
      "cvss": 8.8,
      "epss": 0.00325,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-4728",
      "url": "https://patchblox.com/security/cve/CVE-2026-4728",
      "title": "Spoofing issue in the Privacy: Anti-Tracking component",
      "priority": "Routine",
      "cvss": 6.5,
      "epss": 0.00244,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-3846",
      "url": "https://patchblox.com/security/cve/CVE-2026-3846",
      "title": "Same-origin policy bypass in the CSS Parsing and Computation component",
      "priority": "Routine",
      "cvss": 6.5,
      "epss": 0.00134,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}