Issued at: 2026-10-31
Updated at: 2026-11-01
Advisory content derived from Red Hat RHSA-2026:89758, © Red Hat, Inc., used under CC BY 4.0, with modifications.
Synopsis
Important: firefox security, bug fix, and enhancement update
Description
Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.
Security Fix(es):
* libexpat: denial of service via crafted XML input (CVE-2026-45186)
* expat: expat: Information disclosure via heap buffer over-read in XML_ParseBuffer (CVE-2026-77214)
* firefox: thunderbird: Privilege escalation in the Application Update component (CVE-2026-109704)
* firefox: Use-after-free in the XML component (CVE-2026-109718)
* 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: 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 JavaScript Engine: JIT component (CVE-2026-109729)
* 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: Integer overflow in the Layout: Text and Fonts component (CVE-2026-109723)
* 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: Sandbox escape due to use-after-free in the Networking component (CVE-2026-109707)
* firefox: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-109720)
* 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: Use-after-free in the DOM: Streams component (CVE-2026-109732)
* 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: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-109722)
* firefox: Use-after-free in the DOM: Animation component (CVE-2026-109728)
* firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component (CVE-2026-109721)
Bug Fix(es) and Enhancement(s):
* Firefox ESR 153 rebase [rhel-10.2.z] (JIRA:Rocky Linux-175166)
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.