Thunderbird Security Update — AlmaLinux 9 (ALSA-2026:49921)

Security Fix(es):

* firefox: thunderbird: Site isolation issue in the DOM: Navigation component (CVE-2026-15719)
* firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-15718)
* firefox: thunderbird: Mitigation bypass in the Enterprise Policies component (CVE-2026-16390)
* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: cubeb component (CVE-2026-16350)
* firefox: thunderbird: Information disclosure in the Storage: IndexedDB component (CVE-2026-16391)
* firefox: thunderbird: Site isolation issue in the Networking: HTTP component (CVE-2026-16375)
* firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16356)
* firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-16363)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153 (CVE-2026-16412)
* firefox: thunderbird: Same-origin policy bypass in the Networking: DNS component (CVE-2026-16381)
* firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-16355)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13 (CVE-2026-16361)
* firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16352)
* firefox: thunderbird: Incorrect boundary conditions in the JavaScript: WebAssembly component (CVE-2026-16368)
* firefox: thunderbird: Mitigation bypass in the PDF Viewer component (CVE-2026-16377)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38, Firefox ESR 140.13 and Firefox 153 (CVE-2026-16360)
* firefox: thunderbird: Use-after-free in the WebRTC: Audio/Video component (CVE-2026-16362)
* firefox: thunderbird: Site isolation issue in the Graphics: WebRender component (CVE-2026-16358)
* firefox: thunderbird: Site isolation issue in the Networking component (CVE-2026-16387)
* firefox: thunderbird: Same-origin policy bypass in the DOM: Navigation component (CVE-2026-16349)
* firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-16357)
* firefox: thunderbird: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-16351)
* firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-16371)
* firefox: thunderbird: Privilege escalation in the DOM: Content Processes component (CVE-2026-16379)
* firefox: thunderbird: Information disclosure in the Graphics: ImageLib component (CVE-2026-16354)
* firefox: thunderbird: Information disclosure in the Framework component in DevTools (CVE-2026-16374)
* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-16359)
* firefox: thunderbird: Mitigation bypass in the DOM: Networking component (CVE-2026-16383)
* firefox: thunderbird: Integer overflow in the JavaScript: WebAssembly component (CVE-2026-16369)
* firefox: thunderbird: Invalid pointer in the DOM: Bindings (WebIDL) component (CVE-2026-16353)
* firefox: thunderbird: Privilege escalation in WebExtensions (CVE-2026-16396)
* firefox: thunderbird: Information disclosure in the Networking: WebSockets component (CVE-2026-16405)
* thunderbird: Off-by-one out of bounds read in MIME header parser for forwarding (CVE-2026-14899)

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.