{
  "fix": "RHSA-2026:27717",
  "url": "https://patchblox.com/security/fix/linux/rhsa-2026-27717",
  "summary": "RHSA-2026:27717, released June 24, 2026, fixes 29 CVEs in firefox (version 0:140.12.0-1.el8_10). None of them is reported as exploited. Patch Radar priority: Urgent.",
  "platform": "linux",
  "type": "advisory",
  "title": "firefox security update",
  "released": "2026-06-24T14:07:58Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2026-12297, rated Critical",
  "supported": true,
  "cveCount": 29,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.00493,
  "maxCvss": 9.6,
  "vendorAdvisory": "https://access.redhat.com/errata/RHSA-2026:27717",
  "appliesTo": [
    {
      "product": "firefox",
      "productUrl": "https://patchblox.com/security/product/linux/firefox",
      "release": "RHEL 8",
      "fixedVersion": "0:140.12.0-1.el8_10",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2026-12295",
      "url": "https://patchblox.com/security/cve/CVE-2026-12295",
      "title": "Sandbox escape in the DOM: Navigation component",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.6,
      "epss": 0.00393,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12296",
      "url": "https://patchblox.com/security/cve/CVE-2026-12296",
      "title": "Sandbox escape in the Security: Process Sandboxing component",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.6,
      "epss": 0.00393,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12297",
      "url": "https://patchblox.com/security/cve/CVE-2026-12297",
      "title": "Sandbox escape due to incorrect boundary conditions in the Networking component",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.6,
      "epss": 0.00393,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12294",
      "url": "https://patchblox.com/security/cve/CVE-2026-12294",
      "title": "Sandbox escape in the DOM: Workers component",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.6,
      "epss": 0.00363,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12315",
      "url": "https://patchblox.com/security/cve/CVE-2026-12315",
      "title": "Mitigation bypass in the DOM: Security component",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.1,
      "epss": 0.00251,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12304",
      "url": "https://patchblox.com/security/cve/CVE-2026-12304",
      "title": "Same-origin policy bypass in the Networking: Cookies component",
      "priority": "Urgent",
      "severity": "critical",
      "cvss": 9.1,
      "epss": 0.00189,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12292",
      "url": "https://patchblox.com/security/cve/CVE-2026-12292",
      "title": "Incorrect boundary conditions in the Web Audio component",
      "priority": "High",
      "severity": "high",
      "cvss": 8.1,
      "epss": 0.00493,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12328",
      "url": "https://patchblox.com/security/cve/CVE-2026-12328",
      "title": "Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152",
      "priority": "High",
      "severity": "high",
      "cvss": 8.1,
      "epss": 0.00476,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12327",
      "url": "https://patchblox.com/security/cve/CVE-2026-12327",
      "title": "Memory safety bugs fixed in Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152",
      "priority": "High",
      "severity": "high",
      "cvss": 8.1,
      "epss": 0.00407,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12290",
      "url": "https://patchblox.com/security/cve/CVE-2026-12290",
      "title": "Memory safety bug fixed in Thunderbird 152",
      "priority": "High",
      "severity": "high",
      "cvss": 8.1,
      "epss": 0.00397,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12289",
      "url": "https://patchblox.com/security/cve/CVE-2026-12289",
      "title": "Privilege escalation in the Graphics: WebRender component",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00395,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12291",
      "url": "https://patchblox.com/security/cve/CVE-2026-12291",
      "title": "Use-after-free in the Networking: HTTP component",
      "priority": "High",
      "severity": "high",
      "cvss": 8.8,
      "epss": 0.00382,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12305",
      "url": "https://patchblox.com/security/cve/CVE-2026-12305",
      "title": "Memory safety bug fixed in Thunderbird 152",
      "priority": "High",
      "severity": "high",
      "cvss": 7.5,
      "epss": 0.00374,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12329",
      "url": "https://patchblox.com/security/cve/CVE-2026-12329",
      "title": "Memory safety bug fixed in Thunderbird ESR 140.12",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00313,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12298",
      "url": "https://patchblox.com/security/cve/CVE-2026-12298",
      "title": "Memory safety bug fixed in Thunderbird 152",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00306,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12299",
      "url": "https://patchblox.com/security/cve/CVE-2026-12299",
      "title": "JIT miscompilation in the DOM: Core \u0026 HTML component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00306,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12306",
      "url": "https://patchblox.com/security/cve/CVE-2026-12306",
      "title": "Memory safety bug fixed in Thunderbird 152",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00261,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12307",
      "url": "https://patchblox.com/security/cve/CVE-2026-12307",
      "title": "Memory safety bug fixed in Thunderbird 152",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00261,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12308",
      "url": "https://patchblox.com/security/cve/CVE-2026-12308",
      "title": "Memory safety bug fixed in Thunderbird 152",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.00261,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12310",
      "url": "https://patchblox.com/security/cve/CVE-2026-12310",
      "title": "Memory safety bug fixed in Thunderbird 152",
      "priority": "High",
      "severity": "high",
      "cvss": 7.5,
      "epss": 0.00252,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12312",
      "url": "https://patchblox.com/security/cve/CVE-2026-12312",
      "title": "Memory safety bug fixed in Thunderbird 152",
      "priority": "High",
      "severity": "high",
      "cvss": 7.5,
      "epss": 0.00252,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12314",
      "url": "https://patchblox.com/security/cve/CVE-2026-12314",
      "title": "Memory safety bug fixed in Thunderbird 152",
      "priority": "High",
      "severity": "high",
      "cvss": 7.5,
      "epss": 0.00252,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12302",
      "url": "https://patchblox.com/security/cve/CVE-2026-12302",
      "title": "Mitigation bypass in the DOM: Security component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00248,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12309",
      "url": "https://patchblox.com/security/cve/CVE-2026-12309",
      "title": "Memory safety bug fixed in Thunderbird 152",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00235,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12325",
      "url": "https://patchblox.com/security/cve/CVE-2026-12325",
      "title": "Denial-of-service in the Graphics: ImageLib component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00227,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12324",
      "url": "https://patchblox.com/security/cve/CVE-2026-12324",
      "title": "Incorrect boundary conditions in the Graphics: CanvasWebGL component",
      "priority": "High",
      "severity": "high",
      "cvss": 7.5,
      "epss": 0.00209,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12311",
      "url": "https://patchblox.com/security/cve/CVE-2026-12311",
      "title": "Information disclosure, sandbox escape in the Security: Process Sandboxing component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00185,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12313",
      "url": "https://patchblox.com/security/cve/CVE-2026-12313",
      "title": "Information disclosure, sandbox escape in the Security: Process Sandboxing component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00175,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-12330",
      "url": "https://patchblox.com/security/cve/CVE-2026-12330",
      "title": "Incorrect boundary conditions in the Internationalization component",
      "priority": "High",
      "severity": "medium",
      "cvss": 7.5,
      "epss": 0.00164,
      "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"
  }
}