Issued at: 2026-10-24
Updated at: 2026-10-24
Advisory content derived from Red Hat RHSA-2026:76764, © Red Hat, Inc., used under CC BY 4.0, with modifications.
Synopsis
Important: firefox security update
Description
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.