RHSA-2026:83076 — Security Advisory

Red Hat Security Advisory: firefox security update

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Severity

Important

Red Hat Product Security

RHEL 8

Products

Official CSAF product identity

Published · October 15, 2026

Updated · October 15, 2026

Topic

An update for firefox is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.

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.