The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:85244 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    Security Fix(es):

    * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100832)

    * firefox: Use-after-free in the Layout: Text and Fonts component (CVE-2026-100784)

    * firefox: thunderbird: Privilege escalation in the DLL Services component (CVE-2026-100801)

    * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Internationalization     component (CVE-2026-100794)

    * firefox: thunderbird: Privilege escalation in the Address Bar component (CVE-2026-100820)

    * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100777)

    * firefox: thunderbird: Information disclosure in the Networking: JAR component (CVE-2026-100766)

    * firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100779)

    * firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-100807)

    * firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-100792)

    * firefox: Privilege escalation due to use-after-free in the Graphics: WebRender component     (CVE-2026-100797)

    * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the XPCOM component     (CVE-2026-100819)

    * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100776)

    * firefox: thunderbird: Use-after-free in the Widget component (CVE-2026-100757)

    * firefox: Sandbox escape due to use-after-free in the Graphics component (CVE-2026-100786)

    * firefox: thunderbird: Information disclosure in the Networking component (CVE-2026-96869)

    * firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100770)

    * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100769)

    * firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100791)

    * firefox: thunderbird: Sandbox escape due to use-after-free in the Widget: Gtk component     (CVE-2026-100818)

    * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics     component (CVE-2026-100782)

    * firefox: firefox: Sandbox escape via use-after-free in DOM component (CVE-2026-100811)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100772)

    * firefox: thunderbird: Uninitialized memory in the Storage: Quota Manager component (CVE-2026-100759)

    * firefox: Sandbox escape due to use-after-free in the DOM: Core & HTML component (CVE-2026-100778)

    * firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-100758)

    * firefox: thunderbird: Sandbox escape in the Graphics component (CVE-2026-100775)

    * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender     component (CVE-2026-100781)

    * firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100774)

    * firefox: thunderbird: Same-origin policy bypass in the WebExtensions component (CVE-2026-100803)

    * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100789)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100785)

    * firefox: thunderbird: Site isolation issue in the Panning and Zooming component (CVE-2026-100821)

    * firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-100788)

    * firefox: thunderbird: Undefined behavior in the DOM: Streams component (CVE-2026-100771)

    * firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100762)

    * firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100790)

    * firefox: thunderbird: Use-after-free in the Storage: IndexedDB component (CVE-2026-100773)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100780)

    * firefox: thunderbird: Use-after-free in the Networking: Cache component (CVE-2026-100767)

    * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component     (CVE-2026-100756)

    * firefox: thunderbird: Uninitialized memory in the Audio/Video component (CVE-2026-100783)

    For 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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_76761 advisory.

    * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics component     (CVE-2026-92035)

    * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100832)

    * firefox: Use-after-free in the Layout: Text and Fonts component (CVE-2026-100784)

    * firefox: thunderbird: Privilege escalation in the DLL Services component (CVE-2026-100801)

    * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Internationalization     component (CVE-2026-100794)

    * firefox: thunderbird: Privilege escalation in the Address Bar component (CVE-2026-100820)

    * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100777)

    * firefox: thunderbird: Information disclosure in the Networking: JAR component (CVE-2026-100766)

    * firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100779)

    * firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-100807)

    * firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-100792)

    * firefox: Privilege escalation due to use-after-free in the Graphics: WebRender component     (CVE-2026-100797)

    * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the XPCOM component     (CVE-2026-100819)

    * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100776)

    * firefox: thunderbird: Use-after-free in the Widget component (CVE-2026-100757)

    * firefox: Sandbox escape due to use-after-free in the Graphics component (CVE-2026-100786)

    * firefox: thunderbird: Information disclosure in the Networking component (CVE-2026-96869)

    * firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100770)

    * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100769)

    * firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100791)

    * firefox: thunderbird: Sandbox escape due to use-after-free in the Widget: Gtk component     (CVE-2026-100818)

    * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics     component (CVE-2026-100782)

    * firefox: firefox: Sandbox escape via use-after-free in DOM component (CVE-2026-100811)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100772)

    * firefox: thunderbird: Uninitialized memory in the Storage: Quota Manager component (CVE-2026-100759)

    * firefox: Sandbox escape due to use-after-free in the DOM: Core & HTML component (CVE-2026-100778)

    * firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-100758)

    * firefox: thunderbird: Sandbox escape in the Graphics component (CVE-2026-100775)

    * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender     component (CVE-2026-100781)

    * firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100774)

    * firefox: thunderbird: Same-origin policy bypass in the WebExtensions component (CVE-2026-100803)

    * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100789)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100785)

    * firefox: thunderbird: Site isolation issue in the Panning and Zooming component (CVE-2026-100821)

    * firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-100788)

    * firefox: thunderbird: Undefined behavior in the DOM: Streams component (CVE-2026-100771)

    * firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100762)

    * firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100790)

    * firefox: thunderbird: Use-after-free in the Storage: IndexedDB component (CVE-2026-100773)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100780)

    * firefox: thunderbird: Use-after-free in the Networking: Cache component (CVE-2026-100767)

    * firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component     (CVE-2026-100756)

    * firefox: thunderbird: Uninitialized memory in the Audio/Video component (CVE-2026-100783)

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3281 advisory.

    Information disclosure in the Networking: JAR component. This vulnerability was fixed in Firefox ESR     153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. (CVE-2026-100766)

    Sandbox escape in the XUL component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
    (CVE-2026-100787)

    Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109704)

    Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the     Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109705)

    Use-after-free in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 158, Firefox     ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109706)

    Sandbox escape due to use-after-free in the Networking component. This vulnerability was fixed in Firefox     158 and Firefox ESR 153.5. (CVE-2026-109707)

    Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was     fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109708)

    Information disclosure, privilege escalation in the Security: Process Sandboxing component. This     vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109709)

    Use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 158, Firefox ESR     115.43, and Firefox ESR 153.5. (CVE-2026-109710)

    Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109711)

    Sandbox escape due to uninitialized memory in the Graphics component. This vulnerability was fixed in     Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109712)

    Use-after-free in the Crash Reporting component. This vulnerability was fixed in Firefox 158 and Firefox     ESR 153.5. (CVE-2026-109713)

    Incorrect boundary conditions in the JavaScript Engine component. This vulnerability was fixed in Firefox     158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109715)

    Incorrect boundary conditions in the JavaScript Engine component. This vulnerability was fixed in Firefox     158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109716)

    Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109717)

    Use-after-free in the XML component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and     Firefox ESR 153.5. (CVE-2026-109718)

    Race condition, use-after-free in the Graphics: CanvasWebGL component. This vulnerability was fixed in     Firefox 158, Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109719)

    JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158     and Firefox ESR 153.5. (CVE-2026-109720)

    Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in     Firefox 158 and Firefox ESR 153.5. (CVE-2026-109721)

    JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158,     Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109722)

    Integer overflow in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109723)

    Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158 and Firefox     ESR 153.5. (CVE-2026-109724)

    Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158, Firefox ESR     115.43, and Firefox ESR 153.5. (CVE-2026-109725)

    Use-after-free in the SVG component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, and     Firefox ESR 153.5. (CVE-2026-109726)

    Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 158, Firefox ESR     115.43, and Firefox ESR 153.5. (CVE-2026-109727)

    Use-after-free in the DOM: Animation component. This vulnerability was fixed in Firefox 158, Firefox ESR     115.43, and Firefox ESR 153.5. (CVE-2026-109728)

    Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158,     Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109729)

    Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 158, Firefox ESR     115.43, and Firefox ESR 153.5. (CVE-2026-109730)

    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox     158 and Firefox ESR 153.5. (CVE-2026-109731)

    Use-after-free in the DOM: Streams component. This vulnerability was fixed in Firefox 158, Firefox ESR     115.43, and Firefox ESR 153.5. (CVE-2026-109732)

    JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158,     Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109733)

    Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 158 and Firefox     ESR 153.5. (CVE-2026-109734)

    Frame poisoning in the Layout component. This vulnerability was fixed in Firefox 158 and Firefox ESR     153.5. (CVE-2026-109736)

    Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109737)

    Use-after-free in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109738)

    Use-after-free in the Storage: Bucket File System component. This vulnerability was fixed in Firefox 158     and Firefox ESR 153.5. (CVE-2026-109741)

    Information disclosure in the PDF Viewer component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109742)

    Privilege escalation in the Panning and Zooming component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109743)

    Other issue in the DOM: File component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.
    (CVE-2026-109744)

    Sandbox escape due to uninitialized memory in the DOM: Web Serial component. This vulnerability was fixed     in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109745)

    Information disclosure in the Networking component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109751)

    Use-after-free in the DOM: Workers component. This vulnerability was fixed in Firefox 158 and Firefox ESR     153.5. (CVE-2026-109752)

    Incorrect boundary conditions in the Layout component. This vulnerability was fixed in Firefox 158,     Firefox ESR 115.43, and Firefox ESR 153.5. (CVE-2026-109753)

    Incorrect boundary conditions in the DOM: Editor component. This vulnerability was fixed in Firefox 158     and Firefox ESR 153.5. (CVE-2026-109754)

    Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109756)

    Sandbox escape due to race condition in the Networking component. This vulnerability was fixed in Firefox     158 and Firefox ESR 153.5. (CVE-2026-109757)

    Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox     ESR 153.5. (CVE-2026-109759)

    Mitigation bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109760)

    Incorrect boundary conditions in the SVG component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109762)

    Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 158 and Firefox     ESR 153.5. (CVE-2026-109763)

    Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109764)

    Race condition, use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox     158 and Firefox ESR 153.5. (CVE-2026-109765)

    Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109766)

    Information disclosure in the Networking component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109767)

    Spoofing issue in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158 and Firefox     ESR 153.5. (CVE-2026-109770)

    Denial-of-service in the WebRTC component. This vulnerability was fixed in Firefox 158 and Firefox ESR     153.5. (CVE-2026-109775)

    Race condition in the XPCOM component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.
    (CVE-2026-109776)

    Information disclosure in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 158     and Firefox ESR 153.5. (CVE-2026-109777)

    Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109778)

    Denial-of-service in the Printing: Output component. This vulnerability was fixed in Firefox 158 and     Firefox ESR 153.5. (CVE-2026-109781)

    Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5.
    (CVE-2026-109782)

    Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5.
    (CVE-2026-109783)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
371629	RHEL 9 : thunderbird (RHSA-2026:85244)	Nessus	Red Hat Local Security Checks	10/23/2026	10/23/2026	critical
371687	Rocky Linux 9 [CIQ] Security Update: firefox / firefox-debuginfo / firefox-debugsource / firefox-x11 Multiple Vulnerabilities (crlsa-2026_76761)	Nessus	Rocky Linux Local Security Checks	10/24/2026	10/24/2026	critical
371845	Amazon Linux 2023 : firefox (ALAS2023-2026-3281)	Nessus	Amazon Linux Local Security Checks	10/25/2026	10/25/2026	critical

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