{
  "fix": "RHSA-2026:65633",
  "url": "https://patchblox.com/security/fix/linux/rhsa-2026-65633",
  "summary": "RHSA-2026:65633, released September 10, 2026, fixes 21 CVEs in thunderbird (version 140.14.0-1.el10_0). None of them is reported as exploited. Patch Radar priority: Urgent.",
  "platform": "linux",
  "type": "advisory",
  "title": "thunderbird security update",
  "released": "2026-09-10T12:14:11Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2026-74964, rated Critical",
  "supported": true,
  "cveCount": 21,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00715,
  "maxCvss": 9.8,
  "vendorAdvisory": "https://access.redhat.com/errata/RHSA-2026:65633",
  "appliesTo": [
    {
      "product": "thunderbird",
      "productUrl": "https://patchblox.com/security/product/linux/thunderbird",
      "release": "RHEL 10",
      "fixedVersion": "140.14.0-1.el10_0",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2026-74964",
      "url": "https://patchblox.com/security/cve/CVE-2026-74964",
      "title": "Integer overflow in the Graphics component",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.8,
      "epss": 0.00684,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74936",
      "url": "https://patchblox.com/security/cve/CVE-2026-74936",
      "title": "Use-after-free in the JavaScript: WebAssembly component",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.8,
      "epss": 0.00592,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74959",
      "url": "https://patchblox.com/security/cve/CVE-2026-74959",
      "title": "Mitigation bypass in the Storage: Cache API component",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.1,
      "epss": 0.00479,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74987",
      "url": "https://patchblox.com/security/cve/CVE-2026-74987",
      "title": "Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154",
      "priority": "High",
      "severity": "important",
      "cvss": 9.8,
      "epss": 0.00715,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74990",
      "url": "https://patchblox.com/security/cve/CVE-2026-74990",
      "title": "Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154",
      "priority": "High",
      "severity": "important",
      "cvss": 9.8,
      "epss": 0.00715,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74935",
      "url": "https://patchblox.com/security/cve/CVE-2026-74935",
      "title": "Privilege escalation in the DOM: Networking component",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00454,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74939",
      "url": "https://patchblox.com/security/cve/CVE-2026-74939",
      "title": "Privilege escalation in the DOM: Navigation component",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00454,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74942",
      "url": "https://patchblox.com/security/cve/CVE-2026-74942",
      "title": "Privilege escalation in the Remote Settings Client component",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00454,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74953",
      "url": "https://patchblox.com/security/cve/CVE-2026-74953",
      "title": "Privilege escalation in the Networking: Cookies component",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00444,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74945",
      "url": "https://patchblox.com/security/cve/CVE-2026-74945",
      "title": "Information disclosure in the Graphics: Text component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00441,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74948",
      "url": "https://patchblox.com/security/cve/CVE-2026-74948",
      "title": "Information disclosure in the Graphics component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00441,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74957",
      "url": "https://patchblox.com/security/cve/CVE-2026-74957",
      "title": "Mitigation bypass in the Safe Browsing component",
      "priority": "High",
      "severity": "high",
      "cvss": 8.1,
      "epss": 0.00434,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74976",
      "url": "https://patchblox.com/security/cve/CVE-2026-74976",
      "title": "JIT miscompilation in the JavaScript Engine: JIT component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00424,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74971",
      "url": "https://patchblox.com/security/cve/CVE-2026-74971",
      "title": "Information disclosure in the DOM: UI Events \u0026 Focus Handling component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00346,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74972",
      "url": "https://patchblox.com/security/cve/CVE-2026-74972",
      "title": "Information disclosure in the DOM: Push Subscriptions component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00346,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74960",
      "url": "https://patchblox.com/security/cve/CVE-2026-74960",
      "title": "Site isolation issue in the WebExtensions component",
      "priority": "High",
      "severity": "high",
      "cvss": 8.1,
      "epss": 0.00224,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74962",
      "url": "https://patchblox.com/security/cve/CVE-2026-74962",
      "title": "Site isolation issue in the Networking: Cookies component",
      "priority": "High",
      "severity": "high",
      "cvss": 8.1,
      "epss": 0.00224,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74973",
      "url": "https://patchblox.com/security/cve/CVE-2026-74973",
      "title": "Race condition, use-after-free in the Graphics component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00215,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74934",
      "url": "https://patchblox.com/security/cve/CVE-2026-74934",
      "title": "Site isolation issue in the Graphics: CanvasWebGL component",
      "priority": "High",
      "severity": "high",
      "cvss": 7.5,
      "epss": 0.00212,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74974",
      "url": "https://patchblox.com/security/cve/CVE-2026-74974",
      "title": "Same-origin policy bypass in the Graphics: ImageLib component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00169,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-74963",
      "url": "https://patchblox.com/security/cve/CVE-2026-74963",
      "title": "Same-origin policy bypass in the Networking: Cookies component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00165,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T06:34:28Z"
}