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OpenAdvisories
High RLSA-2026:99111 81 CVEs

Important: firefox security update

Published Nov 13, 2026 · Updated Nov 13, 2026

Summary

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 JavaScript: GC component (CVE-2026-118007)

* firefox: thunderbird: Sandbox escape due to use-after-free in the XPCOM component (CVE-2026-118021)

* firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-118024)

* firefox: thunderbird: Race condition, use-after-free in the DOM: File component (CVE-2026-118019)

* firefox: thunderbird: Use-after-free in the Audio/Video component (CVE-2026-124860)

* firefox: thunderbird: Site isolation issue in the DOM: Navigation component (CVE-2026-124914)

* firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-124869)

* firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-124854)

* firefox: thunderbird: Use-after-free in the Layout: Positioned component (CVE-2026-124877)

* firefox: thunderbird: Sandbox escape due to use-after-free in the Widget: Gtk component (CVE-2026-124917)

* firefox: thunderbird: Incorrect boundary conditions in the DOM: Selection component (CVE-2026-124891)

* firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-124857)

* firefox: thunderbird: Information disclosure in the Security: RLBox component (CVE-2026-124941)

* firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-124855)

* firefox: thunderbird: Spoofing issue in the Security component (CVE-2026-124934)

* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics: Text component (CVE-2026-124853)

* firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-124905)

* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Storage: Cache API component (CVE-2026-124859)

* firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-124881)

* firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-124862)

* firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-124882)

* firefox: thunderbird: Information disclosure in the Private Browsing component (CVE-2026-124909)

* firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-124876)

* firefox: thunderbird: Use-after-free in the DOM: Workers component (CVE-2026-124893)

* firefox: thunderbird: Use-after-free in the Graphics: WebRender component (CVE-2026-124906)

* firefox: thunderbird: Incorrect boundary conditions in the Layout: Text and Fonts component (CVE-2026-124887)

* firefox: thunderbird: Mitigation bypass in the WebExtensions component (CVE-2026-124910)

* firefox: thunderbird: Privilege escalation in the Nimbus Desktop Client component (CVE-2026-124951)

* firefox: thunderbird: Use-after-free in the Audio/Video component (CVE-2026-124865)

* firefox: thunderbird: Incorrect boundary conditions, use-after-free in the Graphics component (CVE-2026-124948)

* firefox: thunderbird: Undefined behavior in the WebRTC: Networking component (CVE-2026-124935)

* firefox: thunderbird: Incorrect boundary conditions in the DOM: CSS Object Model component (CVE-2026-124875)

* firefox: thunderbird: Sandbox escape due to use-after-free in the IPC component (CVE-2026-124903)

* firefox: thunderbird: Incorrect boundary conditions in the Networking: HTTP component (CVE-2026-124856)

* firefox: thunderbird: Use-after-free in the Networking: Cookies component (CVE-2026-124894)

* firefox: thunderbird: Use-after-free in the Storage: localStorage & sessionStorage component (CVE-2026-124895)

* firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-124885)

* firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-124899)

* firefox: thunderbird: Sandbox escape in the Console component (CVE-2026-124933)

* firefox: thunderbird: Use-after-free in the Layout component (CVE-2026-124866)

* firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-124883)

* firefox: thunderbird: Information disclosure in the Layout: Form Controls component (CVE-2026-124929)

* firefox: thunderbird: Incorrect boundary conditions in the JavaScript: GC component (CVE-2026-124870)

* firefox: thunderbird: Site isolation issue in the Graphics: WebRender component (CVE-2026-124927)

* firefox: thunderbird: Incorrect boundary conditions in the Graphics: WebGPU component (CVE-2026-124915)

* firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-124890)

* firefox: thunderbird: Information disclosure in the Address Bar component (CVE-2026-124930)

* firefox: thunderbird: Invalid pointer in the Layout: Text and Fonts component (CVE-2026-124886)

* firefox: thunderbird: Use-after-free in the DOM: HTML Parser component (CVE-2026-124858)

* firefox: thunderbird: Privilege escalation, sandbox escape due to use-after-free in the Graphics: CanvasWebGL component (CVE-2026-124907)

* firefox: thunderbird: Invalid pointer in the DOM: Editor component (CVE-2026-124873)

* firefox: thunderbird: Spoofing issue in the DOM: Security component (CVE-2026-124912)

* firefox: thunderbird: Same-origin policy bypass in the Networking: HTTP component (CVE-2026-124874)

* firefox: thunderbird: Use-after-free in the JavaScript: GC component (CVE-2026-124892)

* firefox: thunderbird: Invalid pointer in the DOM: Streams component (CVE-2026-124942)

* firefox: thunderbird: Use-after-free in the CSS Transitions and Animations component (CVE-2026-124922)

* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component (CVE-2026-124918)

* firefox: thunderbird: Use-after-free in the JavaScript: GC component (CVE-2026-124884)

* firefox: thunderbird: Incorrect boundary conditions in the DOM: Core & HTML component (C

Fixed packages 16

ReleasePackageFixed in
Rocky Linux · 9 firefox 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox-debuginfo 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox-debuginfo 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox-debuginfo 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox-debuginfo 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox-debugsource 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox-debugsource 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox-debugsource 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox-debugsource 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox-x11 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox-x11 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox-x11 0:153.7.0-1.el9_9
Rocky Linux · 9 firefox-x11 0:153.7.0-1.el9_9

Vulnerabilities 81

References

  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2562015
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    https://bugzilla.redhat.com/show_bug.cgi?id=2562042
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    https://bugzilla.redhat.com/show_bug.cgi?id=2562122
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    https://bugzilla.redhat.com/show_bug.cgi?id=2562259
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    https://bugzilla.redhat.com/show_bug.cgi?id=2569830
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    https://bugzilla.redhat.com/show_bug.cgi?id=2569846
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    https://bugzilla.redhat.com/show_bug.cgi?id=2569877
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    https://bugzilla.redhat.com/show_bug.cgi?id=2569907
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    https://bugzilla.redhat.com/show_bug.cgi?id=2569955
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    https://bugzilla.redhat.com/show_bug.cgi?id=2569957
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    https://bugzilla.redhat.com/show_bug.cgi?id=2569970
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    https://bugzilla.redhat.com/show_bug.cgi?id=2569978
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570012
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570014
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570100
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570107
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570116
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570127
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570137
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570140
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570241
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570248
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570255
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570306
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570334
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570365
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570417
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570433
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570440
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570491
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570514
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    https://bugzilla.redhat.com/show_bug.cgi?id=2570521