RLSA-2026:90913: Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

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.