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      "text" : "An update for firefox is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
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      "text" : "Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.\n\nSecurity Fix(es):\n\n* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics component (CVE-2026-92035)\n\n* firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100832)\n\n* firefox: Use-after-free in the Layout: Text and Fonts component (CVE-2026-100784)\n\n* firefox: thunderbird: Privilege escalation in the DLL Services component (CVE-2026-100801)\n\n* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Internationalization component (CVE-2026-100794)\n\n* firefox: thunderbird: Privilege escalation in the Address Bar component (CVE-2026-100820)\n\n* firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100777)\n\n* firefox: thunderbird: Information disclosure in the Networking: JAR component (CVE-2026-100766)\n\n* firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100779)\n\n* firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-100807)\n\n* firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-100792)\n\n* firefox: Privilege escalation due to use-after-free in the Graphics: WebRender component (CVE-2026-100797)\n\n* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the XPCOM component (CVE-2026-100819)\n\n* firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100776)\n\n* firefox: thunderbird: Use-after-free in the Widget component (CVE-2026-100757)\n\n* firefox: Sandbox escape due to use-after-free in the Graphics component (CVE-2026-100786)\n\n* firefox: thunderbird: Information disclosure in the Networking component (CVE-2026-96869)\n\n* firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100770)\n\n* firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100769)\n\n* firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100791)\n\n* firefox: thunderbird: Sandbox escape due to use-after-free in the Widget: Gtk component (CVE-2026-100818)\n\n* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component (CVE-2026-100782)\n\n* firefox: firefox: Sandbox escape via use-after-free in DOM component (CVE-2026-100811)\n\n* firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100772)\n\n* firefox: thunderbird: Uninitialized memory in the Storage: Quota Manager component (CVE-2026-100759)\n\n* firefox: Sandbox escape due to use-after-free in the DOM: Core & HTML component (CVE-2026-100778)\n\n* firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-100758)\n\n* firefox: thunderbird: Sandbox escape in the Graphics component (CVE-2026-100775)\n\n* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component (CVE-2026-100781)\n\n* firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100774)\n\n* firefox: thunderbird: Same-origin policy bypass in the WebExtensions component (CVE-2026-100803)\n\n* firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100789)\n\n* firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100785)\n\n* firefox: thunderbird: Site isolation issue in the Panning and Zooming component (CVE-2026-100821)\n\n* firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-100788)\n\n* firefox: thunderbird: Undefined behavior in the DOM: Streams component (CVE-2026-100771)\n\n* firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100762)\n\n* firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100790)\n\n* firefox: thunderbird: Use-after-free in the Storage: IndexedDB component (CVE-2026-100773)\n\n* firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100780)\n\n* firefox: thunderbird: Use-after-free in the Networking: Cache component (CVE-2026-100767)\n\n* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-100756)\n\n* firefox: thunderbird: Uninitialized memory in the Audio/Video component (CVE-2026-100783)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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      "category" : "general",
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      "category" : "external",
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      "summary" : "https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-92035",
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      "url" : "https://www.mozilla.org/security/advisories/mfsa2026-99/#CVE-2026-92035"
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      "details" : "Important"
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    "title" : "firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics component"
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    "cve" : "CVE-2026-96869",
    "cwe" : {
      "id" : "CWE-201",
      "name" : "Insertion of Sensitive Information Into Sent Data"
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      "text" : "firefox: thunderbird: Information disclosure in the Networking component",
      "title" : "Vulnerability summary"
    }, {
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      "text" : "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
    } ],
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      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-96869",
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    }, {
      "category" : "external",
      "summary" : "https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-96869",
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    "threats" : [ {
      "category" : "impact",
      "details" : "Moderate"
    } ],
    "title" : "firefox: thunderbird: Information disclosure in the Networking component"
  }, {
    "cve" : "CVE-2026-100756",
    "cwe" : {
      "id" : "CWE-119",
      "name" : "Improper Restriction of Operations within the Bounds of a Memory Buffer"
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    "discovery_date" : "2026-09-29T13:11:01.667411+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2543192"
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      "title" : "Vulnerability description"
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      "text" : "firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
    } ],
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      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-100756"
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      "summary" : "RHBZ#2543192",
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      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-100756",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-100756"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-100756",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-100756"
    }, {
      "category" : "external",
      "summary" : "https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-100756",
      "url" : "https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-100756"
    }, {
      "category" : "external",
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      "url" : "https://www.mozilla.org/security/advisories/mfsa2026-99/#CVE-2026-100756"
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    "threats" : [ {
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      "details" : "Important"
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    "title" : "firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component"
  }, {
    "cve" : "CVE-2026-100757",
    "cwe" : {
      "id" : "CWE-416",
      "name" : "Use After Free"
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    "discovery_date" : "2026-09-29T12:58:07.659873+00:00",
    "ids" : [ {
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      "text" : "2543140"
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    "discovery_date" : "2026-09-29T13:09:40.990532+00:00",
    "ids" : [ {
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      "text" : "2543182"
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    "ids" : [ {
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      "text" : "2543146"
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    "cwe" : {
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      "details" : "Moderate"
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    "title" : "firefox: Privilege escalation due to use-after-free in the Graphics: WebRender component"
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    "cve" : "CVE-2026-100801",
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      "id" : "CWE-269",
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    "discovery_date" : "2026-09-29T12:51:14.332419+00:00",
    "ids" : [ {
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      "category" : "general",
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      "title" : "CVSS score applicability"
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      "category" : "external",
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    "threats" : [ {
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      "details" : "Moderate"
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    "title" : "firefox: thunderbird: Privilege escalation in the DLL Services component"
  }, {
    "cve" : "CVE-2026-100803",
    "cwe" : {
      "id" : "CWE-346",
      "name" : "Origin Validation Error"
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    "discovery_date" : "2026-09-29T13:04:52.999767+00:00",
    "ids" : [ {
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      "text" : "2543164"
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      "category" : "other",
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      "title" : "CVSS score applicability"
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    }, {
      "category" : "external",
      "summary" : "https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-100803",
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      "details" : "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "url" : "https://access.redhat.com/errata/RHSA-2026:92011"
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    "threats" : [ {
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      "details" : "Moderate"
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    "title" : "firefox: thunderbird: Same-origin policy bypass in the WebExtensions component"
  }, {
    "cve" : "CVE-2026-100807",
    "cwe" : {
      "id" : "CWE-269",
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    },
    "discovery_date" : "2026-09-29T12:55:26.530096+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2543130"
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      "category" : "other",
      "text" : "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
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      "category" : "external",
      "summary" : "https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-100807",
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    }, {
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      "details" : "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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    "scores" : [ {
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        "baseSeverity" : "MEDIUM",
        "confidentialityImpact" : "LOW",
        "integrityImpact" : "LOW",
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    "threats" : [ {
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      "details" : "Moderate"
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    "title" : "firefox: thunderbird: Privilege escalation in the DOM: Service Workers component"
  }, {
    "cve" : "CVE-2026-100811",
    "cwe" : {
      "id" : "CWE-825",
      "name" : "Expired Pointer Dereference"
    },
    "discovery_date" : "2026-09-29T13:01:44.355214+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2543154"
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    "notes" : [ {
      "category" : "description",
      "text" : "A flaw was found in Firefox. A use-after-free memory flaw in the Document Object Model (DOM) Core and HTML component allows a remote attacker to perform a sandbox escape. By enticing a user to visit a specially crafted web page, an attacker can leverage this vulnerability to execute arbitrary code outside the browser's restricted sandbox environment.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "firefox: firefox: Sandbox escape via use-after-free in DOM component",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "An IMPORTANT severity use-after-free flaw was found in the Firefox web browser's Document Object Model (DOM) Core and HTML component. A remote attacker could entice a victim to visit a specially crafted web page to trigger the use-after-free condition and execute arbitrary code outside of the browser's restricted sandbox environment, resulting in a sandbox escape and potential compromise of the victim's user session. The firefox component as shipped in affected Red Hat product streams is affected by this flaw; no affected Red Hat product stream is currently distinguished as not affected. Red Hat Product Security has rated this flaw with a CVSS 3.1 score of 6.1 (moderate) (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N), which is substantially lower than the 9.6 (critical) score assigned by CISA; the difference is mainly attributable to Red Hat's lower confidentiality and integrity impact assessment (C:L/I:L/A:N versus C:H/I:H/A:H).",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
    } ],
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      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-100811",
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      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-100811",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-100811"
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      "category" : "external",
      "summary" : "https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-100811",
      "url" : "https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-100811"
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      "category" : "external",
      "summary" : "https://www.mozilla.org/security/advisories/mfsa2026-99/#CVE-2026-100811",
      "url" : "https://www.mozilla.org/security/advisories/mfsa2026-99/#CVE-2026-100811"
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    "scores" : [ {
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        "baseScore" : 6.1,
        "baseSeverity" : "MEDIUM",
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        "vectorString" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
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    } ],
    "threats" : [ {
      "category" : "impact",
      "details" : "Important"
    } ],
    "title" : "firefox: firefox: Sandbox escape via use-after-free in DOM component"
  }, {
    "cve" : "CVE-2026-100818",
    "cwe" : {
      "id" : "CWE-825",
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      "title" : "Statement"
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      "category" : "general",
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      "title" : "CVSS score applicability"
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      "category" : "external",
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      "details" : "Moderate"
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    "title" : "firefox: thunderbird: Sandbox escape due to use-after-free in the Widget: Gtk component"
  }, {
    "cve" : "CVE-2026-100819",
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      "id" : "CWE-119",
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    "discovery_date" : "2026-09-29T12:56:55.939959+00:00",
    "ids" : [ {
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      "text" : "2543134"
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    }, {
      "category" : "external",
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    "threats" : [ {
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      "details" : "Moderate"
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    "title" : "firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the XPCOM component"
  }, {
    "cve" : "CVE-2026-100820",
    "cwe" : {
      "id" : "CWE-15",
      "name" : "External Control of System or Configuration Setting"
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    "discovery_date" : "2026-09-29T12:53:54.025151+00:00",
    "ids" : [ {
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      "text" : "2543121"
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      "text" : "firefox: thunderbird: Privilege escalation in the Address Bar component",
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      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
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    "cwe" : {
      "id" : "CWE-346",
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      "text" : "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
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    }, {
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      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-100821",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-100821"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-100821",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-100821"
    }, {
      "category" : "external",
      "summary" : "https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-100821",
      "url" : "https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-100821"
    }, {
      "category" : "external",
      "summary" : "https://www.mozilla.org/security/advisories/mfsa2026-99/#CVE-2026-100821",
      "url" : "https://www.mozilla.org/security/advisories/mfsa2026-99/#CVE-2026-100821"
    } ],
    "release_date" : "2026-09-29T12:36:30.318000+00:00",
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      "date" : "2026-10-28T16:53:27+00:00",
      "details" : "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "url" : "https://access.redhat.com/errata/RHSA-2026:92011"
    }, {
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    "scores" : [ {
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        "availabilityImpact" : "NONE",
        "baseScore" : 6.1,
        "baseSeverity" : "MEDIUM",
        "confidentialityImpact" : "LOW",
        "integrityImpact" : "LOW",
        "privilegesRequired" : "NONE",
        "scope" : "CHANGED",
        "userInteraction" : "REQUIRED",
        "vectorString" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
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    } ],
    "threats" : [ {
      "category" : "impact",
      "details" : "Moderate"
    } ],
    "title" : "firefox: thunderbird: Site isolation issue in the Panning and Zooming component"
  }, {
    "cve" : "CVE-2026-100832",
    "cwe" : {
      "id" : "CWE-416",
      "name" : "Use After Free"
    },
    "discovery_date" : "2026-09-29T12:51:31.326581+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2543113"
    } ],
    "notes" : [ {
      "category" : "description",
      "text" : "A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nUse-after-free in the Graphics: Canvas2D component",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
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      "summary" : "RHBZ#2543113",
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      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-100832"
    }, {
      "category" : "external",
      "summary" : "https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-100832",
      "url" : "https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-100832"
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      "url" : "https://www.mozilla.org/security/advisories/mfsa2026-99/#CVE-2026-100832"
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    "remediations" : [ {
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      "url" : "https://access.redhat.com/errata/RHSA-2026:92011"
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        "attackVector" : "NETWORK",
        "availabilityImpact" : "HIGH",
        "baseScore" : 7.5,
        "baseSeverity" : "HIGH",
        "confidentialityImpact" : "HIGH",
        "integrityImpact" : "HIGH",
        "privilegesRequired" : "NONE",
        "scope" : "UNCHANGED",
        "userInteraction" : "REQUIRED",
        "vectorString" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
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      "details" : "Important"
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    "title" : "firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component"
  } ]
}