RHSA-2026:76761

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Security Fix(es): * 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) 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.