RHSA-2026:82817 — Security Advisory

Red Hat Security Advisory: firefox security update

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Severity

Important

Red Hat Product Security

RHEL 9

Products

Official CSAF product identity

Published · October 14, 2026

Updated · October 15, 2026

Topic

An update for firefox is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.

Security Fix(es):

firefox: thunderbird: Use-after-free in the SVG component (CVE-2026-92024)
firefox: thunderbird: Mitigation bypass in the Remote Settings Client component (CVE-2026-92019)
firefox: thunderbird: Use-after-free in the Networking component (CVE-2026-92026)
firefox: thunderbird: Information disclosure in the Graphics: ImageLib component (CVE-2026-92031)
firefox: thunderbird: Sandbox escape due to invalid pointer in the Graphics component (CVE-2026-92032)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92010)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92006)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92011)
firefox: thunderbird: Use-after-free in the DOM: Streams component (CVE-2026-92027)
firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-92028)
firefox: thunderbird: Privilege escalation in the WebExtensions component (CVE-2026-92015)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92013)
firefox: thunderbird: Use-after-free in the Disability Access APIs component (CVE-2026-92016)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92012)
firefox: thunderbird: Use-after-free in the DOM: HTML Parser component (CVE-2026-92022)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component (CVE-2026-92014)
firefox: thunderbird: Sandbox escape in the DOM: Core & HTML component (CVE-2026-92018)
firefox: thunderbird: Use-after-free in the JavaScript Engine: JIT component (CVE-2026-92021)
firefox: thunderbird: Use-after-free in the Audio/Video: Web Codecs component (CVE-2026-92005)
firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-92017)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92009)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component (CVE-2026-92020)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92008)
firefox: thunderbird: Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component (CVE-2026-92030)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92007)
firefox: thunderbird: Use-after-free in the DOM: Navigation component (CVE-2026-92025)
firefox: thunderbird: Use-after-free in the SVG component (CVE-2026-92029)
firefox: thunderbird: Use-after-free in the XML component (CVE-2026-92023)

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.