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    9.8
    Critical

    CVE-2026-109774

    Last Modified: 26 Oct 2026

    Invalid pointer, undefined behavior in the DOM: Notifications component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    6.5
    Medium

    CVE-2026-109773

    Last Modified: 13 Oct 2026

    Denial-of-service in the Sync component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    9.1
    Critical

    CVE-2026-109772

    Last Modified: 27 Oct 2026

    Same-origin policy bypass in the DevTools component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    4.3
    Medium

    CVE-2026-109771

    Last Modified: 13 Oct 2026

    Information disclosure in the WebRTC: Networking component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    6.1
    Medium

    CVE-2026-109770

    Last Modified: 20 Oct 2026

    Spoofing issue in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    4.3
    Medium

    CVE-2026-109769

    Last Modified: 13 Oct 2026

    Information disclosure in the Networking: Cache component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    6.5
    Medium

    CVE-2026-109768

    Last Modified: 13 Oct 2026

    Denial-of-service in the Site Reports component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    4.3
    Medium

    CVE-2026-109767

    Last Modified: 13 Oct 2026

    Information disclosure in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    8.1
    High

    CVE-2026-109766

    Last Modified: 19 Oct 2026

    Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    4.2
    Medium

    CVE-2026-109765

    Last Modified: 13 Oct 2026

    Race condition, use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109764

    Last Modified: 20 Oct 2026

    Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109763

    Last Modified: 30 Oct 2026

    Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    8.8
    High

    CVE-2026-109762

    Last Modified: 20 Oct 2026

    Incorrect boundary conditions in the SVG component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109761

    Last Modified: 13 Oct 2026

    Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    8.1
    High

    CVE-2026-109760

    Last Modified: 19 Oct 2026

    Mitigation bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    8.1
    High

    CVE-2026-109759

    Last Modified: 19 Oct 2026

    Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    8.3
    High

    CVE-2026-109757

    Last Modified: 17 Oct 2026

    Sandbox escape due to race condition in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    8.8
    High

    CVE-2026-109756

    Last Modified: 14 Oct 2026

    Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    9.6
    Critical

    CVE-2026-109755

    Last Modified: 17 Oct 2026

    Sandbox escape in the DOM: Content Processes component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    8.1
    High

    CVE-2026-109754

    Last Modified: 19 Oct 2026

    Incorrect boundary conditions in the DOM: Editor component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109752

    Last Modified: 13 Oct 2026

    Use-after-free in the DOM: Workers component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    4.3
    Medium

    CVE-2026-109751

    Last Modified: 13 Oct 2026

    Information disclosure in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    9.6
    Critical

    CVE-2026-109750

    Last Modified: 19 Oct 2026

    Site isolation issue in the DOM: Web Authentication component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109749

    Last Modified: 13 Oct 2026

    Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109748

    Last Modified: 13 Oct 2026

    Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    7.3
    High

    CVE-2026-109747

    Last Modified: 19 Oct 2026

    Other issue in the Address Bar component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    7.3
    High

    CVE-2026-109746

    Last Modified: 19 Oct 2026

    Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    9.6
    Critical

    CVE-2026-109745

    Last Modified: 19 Oct 2026

    Sandbox escape due to uninitialized memory in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    8.1
    High

    CVE-2026-109744

    Last Modified: 19 Oct 2026

    Other issue in the DOM: File component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    8.8
    High

    CVE-2026-109743

    Last Modified: 17 Oct 2026

    Privilege escalation in the Panning and Zooming component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    4.3
    Medium

    CVE-2026-109742

    Last Modified: 13 Oct 2026

    Information disclosure in the PDF Viewer component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109741

    Last Modified: 13 Oct 2026

    Use-after-free in the Storage: Bucket File System component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    9.6
    Critical

    CVE-2026-109740

    Last Modified: 19 Oct 2026

    Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    8.8
    High

    CVE-2026-109739

    Last Modified: 14 Oct 2026

    Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109738

    Last Modified: 13 Oct 2026

    Use-after-free in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    8.1
    High

    CVE-2026-109737

    Last Modified: 19 Oct 2026

    Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    8.1
    High

    CVE-2026-109736

    Last Modified: 19 Oct 2026

    Frame poisoning in the Layout component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109735

    Last Modified: 13 Oct 2026

    Use-after-free in the DOM: Animation component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    8.1
    High

    CVE-2026-109734

    Last Modified: 19 Oct 2026

    Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109731

    Last Modified: 19 Oct 2026

    Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109724

    Last Modified: 13 Oct 2026

    Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109723

    Last Modified: 15 Oct 2026

    Integer overflow in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109721

    Last Modified: 19 Oct 2026

    Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    7.1
    High

    CVE-2026-109720

    Last Modified: 19 Oct 2026

    JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109717

    Last Modified: 13 Oct 2026

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

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109714

    Last Modified: 17 Oct 2026

    Incorrect boundary conditions in the Layout component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109713

    Last Modified: 17 Oct 2026

    Use-after-free in the Crash Reporting component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    5.4
    Medium

    CVE-2026-109711

    Last Modified: 14 Oct 2026

    Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    8.8
    High

    CVE-2026-109709

    Last Modified: 13 Oct 2026

    Information disclosure, privilege escalation in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

    Published: 13 Oct 2026
    9.6
    Critical

    CVE-2026-109708

    Last Modified: 27 Oct 2026

    Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.

    Published: 13 Oct 2026