{
  "fix": "RHSA-2026:21382",
  "url": "https://patchblox.com/security/fix/linux/rhsa-2026-21382",
  "summary": "RHSA-2026:21382, released May 27, 2026, fixes 18 CVEs in firefox (version 0:140.11.0-1.el8_10). None of them is reported as exploited. Patch Radar priority: High.",
  "platform": "linux",
  "type": "advisory",
  "title": "firefox security update",
  "released": "2026-05-27T17:38:43Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2026-8956, high severity",
  "supported": true,
  "cveCount": 18,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00605,
  "maxCvss": 9.8,
  "vendorAdvisory": "https://access.redhat.com/errata/RHSA-2026:21382",
  "appliesTo": [
    {
      "product": "firefox",
      "productUrl": "https://patchblox.com/security/product/linux/firefox",
      "release": "RHEL 8",
      "fixedVersion": "0:140.11.0-1.el8_10",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2026-8956",
      "url": "https://patchblox.com/security/cve/CVE-2026-8956",
      "title": "Integer overflow in the Networking: JAR component",
      "priority": "High",
      "severity": "important",
      "cvss": 9.8,
      "epss": 0.00605,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8946",
      "url": "https://patchblox.com/security/cve/CVE-2026-8946",
      "title": "Incorrect boundary conditions in the Audio/Video: Web Codecs component",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.0056,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8953",
      "url": "https://patchblox.com/security/cve/CVE-2026-8953",
      "title": "Sandbox escape due to use-after-free in the Disability Access APIs component",
      "priority": "High",
      "severity": "important",
      "cvss": 9.6,
      "epss": 0.00532,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8975",
      "url": "https://patchblox.com/security/cve/CVE-2026-8975",
      "title": "Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00471,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8954",
      "url": "https://patchblox.com/security/cve/CVE-2026-8954",
      "title": "Incorrect boundary conditions, integer overflow in the Audio/Video component",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.00425,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8947",
      "url": "https://patchblox.com/security/cve/CVE-2026-8947",
      "title": "Use-after-free in the DOM: Bindings (WebIDL) component",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.00413,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8968",
      "url": "https://patchblox.com/security/cve/CVE-2026-8968",
      "title": "Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.00413,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8955",
      "url": "https://patchblox.com/security/cve/CVE-2026-8955",
      "title": "Privilege escalation in the DOM: Workers component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00386,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8957",
      "url": "https://patchblox.com/security/cve/CVE-2026-8957",
      "title": "Privilege escalation in the Enterprise Policies component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00386,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8962",
      "url": "https://patchblox.com/security/cve/CVE-2026-8962",
      "title": "Mitigation bypass in the DOM: Security component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.1,
      "epss": 0.00372,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8974",
      "url": "https://patchblox.com/security/cve/CVE-2026-8974",
      "title": "Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00365,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8958",
      "url": "https://patchblox.com/security/cve/CVE-2026-8958",
      "title": "Information disclosure, sandbox escape in the Security: Process Sandboxing component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.6,
      "epss": 0.00344,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8961",
      "url": "https://patchblox.com/security/cve/CVE-2026-8961",
      "title": "Spoofing issue in the Form Autofill component",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.00322,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8401",
      "url": "https://patchblox.com/security/cve/CVE-2026-8401",
      "title": "Sandbox escape in the Profile Backup component",
      "priority": "High",
      "severity": "important",
      "cvss": 9.8,
      "epss": 0.00313,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8970",
      "url": "https://patchblox.com/security/cve/CVE-2026-8970",
      "title": "Privilege escalation in the Security component",
      "priority": "High",
      "severity": "important",
      "cvss": 8.8,
      "epss": 0.00307,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8391",
      "url": "https://patchblox.com/security/cve/CVE-2026-8391",
      "title": "Other issue in the JavaScript Engine component",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.00298,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8388",
      "url": "https://patchblox.com/security/cve/CVE-2026-8388",
      "title": "Incorrect boundary conditions in the JavaScript Engine: JIT component",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.00244,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-8950",
      "url": "https://patchblox.com/security/cve/CVE-2026-8950",
      "title": "Same-origin policy bypass in the Networking: HTTP component",
      "priority": "High",
      "severity": "important",
      "cvss": 9.3,
      "epss": 0.00194,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T18:46:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}