Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fix(es): * libvpx: Heap buffer overflow in libvpx (CVE-2026-2447) * firefox: Invalid pointer in the JavaScript Engine component (CVE-2026-2785) * firefox: Memory safety bugs fixed in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148 (CVE-2026-2793) * firefox: Undefined behavior in the DOM: Core & HTML component (CVE-2026-2771) * firefox: Integer overflow in the Audio/Video component (CVE-2026-2774) * firefox: Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software (CVE-2026-2776) * firefox: Integer overflow in the Libraries component in NSS (CVE-2026-2781) * firefox: Use-after-free in the JavaScript Engine: JIT component (CVE-2026-2766) * firefox: Use-after-free in the Storage: IndexedDB component (CVE-2026-2769) * firefox: Use-after-free in the DOM: Window and Location component (CVE-2026-2787) * firefox: Sandbox escape in the Storage: IndexedDB component (CVE-2026-2768) * firefox: Information disclosure due to JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-2783) * firefox: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-2788) * firefox: Mitigation bypass in the DOM: Security component (CVE-2026-2784) * firefox: Incorrect boundary conditions in the Graphics: ImageLib component (CVE-2026-2759) * firefox: Integer overflow in the JavaScript: Standard Library component (CVE-2026-2762) * firefox: Sandbox escape in the Graphics: WebRender component (CVE-2026-2761) * firefox: Privilege escalation in the Messaging System component (CVE-2026-2777) * firefox: Same-origin policy bypass in the Networking: JAR component (CVE-2026-2790) * firefox: Mitigation bypass in the DOM: HTML Parser component (CVE-2026-2775) * firefox: Use-after-free in the JavaScript Engine component (CVE-2026-2763) * firefox: Memory safety bugs fixed in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148 (CVE-2026-2792) * firefox: Incorrect boundary conditions in the Web Audio component (CVE-2026-2773) * firefox: Use-after-free in the JavaScript Engine component (CVE-2026-2786) * firefox: Use-after-free in the Graphics: ImageLib component (CVE-2026-2789) * firefox: thunderbird: Incorrect boundary conditions in the WebRTC: Audio/Video component (CVE-2026-2757) * firefox: Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component (CVE-2026-2760) * firefox: Use-after-free in the Audio/Video: Playback component (CVE-2026-2772) * firefox: Incorrect boundary conditions in the Networking: JAR component (CVE-2026-2779) * firefox: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-2767) * firefox: JIT miscompilation, use-after-free in the JavaScript Engine: JIT component (CVE-2026-2764) * firefox: Privilege escalation in the Netmonitor component (CVE-2026-2782) * firefox: Use-after-free in the JavaScript Engine component (CVE-2026-2765) * firefox: Privilege escalation in the Netmonitor component (CVE-2026-2780) * firefox: Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component (CVE-2026-2778) * firefox: Use-after-free in the JavaScript: GC component (CVE-2026-2758) * firefox: Mitigation bypass in the Networking: Cache component (CVE-2026-2791) * firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-2770) 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.