RLSA-2026:93443: Important: thunderbird security, bug fix, and enhancement update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

libexpat: denial of service via crafted XML input (CVE-2026-45186)

firefox: Mitigation bypass in the Enterprise Policies component (CVE-2026-109764)

firefox: Spoofing issue in the DOM: Web Serial component (CVE-2026-109770)

firefox: Mitigation bypass in the File Handling component (CVE-2026-109783)

firefox: thunderbird: Privilege escalation in the Application Update component (CVE-2026-109704)

firefox: Use-after-free in the XML component (CVE-2026-109718)

firefox: Information disclosure in the PDF Viewer component (CVE-2026-109742)

firefox: Incorrect boundary conditions in the JavaScript Engine component (CVE-2026-109715)

firefox: firefox: Sandbox escape via incorrect boundary conditions in Win32 widget (CVE-2026-109740)

firefox: Use-after-free in the Storage: IndexedDB component (CVE-2026-109706)

firefox: Use-after-free in the Crash Reporting component (CVE-2026-109713)

firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-109724)

firefox: Sandbox escape due to uninitialized memory in the DOM: Web Serial component (CVE-2026-109745)

firefox: Mitigation bypass in the File Handling component (CVE-2026-109782)

firefox: Information disclosure, privilege escalation in the Security: Process Sandboxing component (CVE-2026-109709)

firefox: Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component (CVE-2026-109705)

firefox: Use-after-free in the Audio/Video: Playback component (CVE-2026-109738)

firefox: Sandbox escape due to race condition in the Networking component (CVE-2026-109757)

firefox: Use-after-free in the Storage: Bucket File System component (CVE-2026-109741)

firefox: Use-after-free in the JavaScript Engine: JIT component (CVE-2026-109729)

firefox: Other issue in the DOM: File component (CVE-2026-109744)

firefox: Incorrect boundary conditions in the JavaScript Engine component (CVE-2026-109716)

firefox: Race condition, use-after-free in the Graphics: CanvasWebGL component (CVE-2026-109719)

firefox: Incorrect boundary conditions in the Layout component (CVE-2026-109753)

firefox: Integer overflow in the Layout: Text and Fonts component (CVE-2026-109723)

firefox: Privilege escalation in the DOM: Navigation component (CVE-2026-109756)

firefox: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-109733)

firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-109734)

firefox: Mitigation bypass in the File Handling component (CVE-2026-109763)

firefox: Sandbox escape due to incorrect boundary conditions in the Networking component (CVE-2026-109708)

firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-109717)

firefox: Use-after-free in the DOM: Workers component (CVE-2026-109752)

firefox: Race condition in the XPCOM component (CVE-2026-109776)

firefox: Sandbox escape due to use-after-free in the Networking component (CVE-2026-109707)

firefox: Mitigation bypass in the Networking: HTTP component (CVE-2026-109760)

firefox: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-109720)

firefox: Information disclosure in the Storage: IndexedDB component (CVE-2026-109777)

firefox: Use-after-free in the SVG component (CVE-2026-109726)

firefox: Integer overflow in the Graphics component (CVE-2026-109730)

firefox: Use-after-free in the Audio/Video component (CVE-2026-109727)

firefox: Mitigation bypass in the Enterprise Policies component (CVE-2026-109737)

firefox: Mitigation bypass in the Enterprise Policies component (CVE-2026-109766)

firefox: Use-after-free in the DOM: Streams component (CVE-2026-109732)

firefox: Site isolation issue in the Networking component (CVE-2026-109759)

firefox: Privilege escalation in the WebExtensions component (CVE-2026-109778)

firefox: Incorrect boundary conditions in the SVG component (CVE-2026-109762)

firefox: Race condition, use-after-free in the Graphics: Text component (CVE-2026-109765)

firefox: Incorrect boundary conditions in the DOM: Editor component (CVE-2026-109754)

firefox: Information disclosure in the Networking component (CVE-2026-109751)

firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-109725)

firefox: Sandbox escape due to uninitialized memory in the Graphics component (CVE-2026-109712)

firefox: Use-after-free in the Graphics: Canvas2D component (CVE-2026-109711)

firefox: Frame poisoning in the Layout component (CVE-2026-109736)

firefox: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-109722)

firefox: Information disclosure in the Networking component (CVE-2026-109767)

firefox: Denial-of-service in the WebRTC component (CVE-2026-109775)

firefox: Use-after-free in the DOM: Animation component (CVE-2026-109728)

firefox: Denial-of-service in the Printing: Output component (CVE-2026-109781)

firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-109710)

firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-109731)

firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component (CVE-2026-109721)

firefox: Privilege escalation in the Panning and Zooming component (CVE-2026-109743)

Bug Fix(es) and Enhancement(s):

Thunderbird ESR 153 rebase [rhel-9.8.z] (JIRA:Rocky Linux-175199)

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.