RLSA-2026:99112: Important: firefox security update

Published Nov 13, 2026
·
Updated

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 (CVE-2026-124868)

firefox: thunderbird: Privilege escalation due to use-after-free in the WebRTC: Networking component (CVE-2026-124919)

firefox: thunderbird: Incorrect boundary conditions in the Graphics: WebRender component (CVE-2026-124924)

firefox: thunderbird: Same-origin policy bypass due to race condition in the Audio/Video component (CVE-2026-124902)

firefox: thunderbird: Invalid pointer in the Networking: Cache component (CVE-2026-124879)

firefox: thunderbird: Use-after-free in the Graphics component (CVE-2026-124932)

firefox: thunderbird: Mitigation bypass in the File Handling component (CVE-2026-124940)

firefox: thunderbird: Same-origin policy bypass in the DOM: Core & HTML component (CVE-2026-124931)

firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-124926)

firefox: thunderbird: Use-after-free in the DOM: HTML Parser component (CVE-2026-124863)

firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-124889)

firefox: thunderbird: Site isolation issue in the Networking component (CVE-2026-124913)

firefox: thunderbird: Use-after-free in the JavaScript: GC component (CVE-2026-124897)

firefox: thunderbird: Sandbox escape due to use-after-free in the DOM: Service Workers component (CVE-2026-124864)

firefox: thunderbird: Use-after-free in the Cycle Collector component (CVE-2026-124872)

firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-124880)

firefox: thunderbird: Invalid pointer in the Layout: Text and Fonts component (CVE-2026-124896)

firefox: thunderbird: Other issue in the Networking: JAR component (CVE-2026-124901)

firefox: thunderbird: Incorrect boundary conditions in the Layout: Text and Fonts component (CVE-2026-124888)

firefox: thunderbird: Mitigation bypass in the Add-ons Manager component (CVE-2026-124938)

firefox: thunderbird: Sandbox escape due to use-after-free in the Audio/Video: cubeb component (CVE-2026-124861)

firefox: thunderbird: Use-after-free in the DOM: Editor component (CVE-2026-124898)

firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-124939)

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.

Affected Software

3 affected componentsFixes available
rocky-linux/firefox<0:153.7.0-1.el8_10
0:153.7.0-1.el8_10
rocky-linux/firefox-debuginfo<0:153.7.0-1.el8_10
0:153.7.0-1.el8_10
rocky-linux/firefox-debugsource<0:153.7.0-1.el8_10
0:153.7.0-1.el8_10

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade rocky-linux/firefox to a version that resolves this vulnerability.

    Fixed in 0:153.7.0-1.el8_10
  2. Upgrade

    Upgrade rocky-linux/firefox-debuginfo to a version that resolves this vulnerability.

    Fixed in 0:153.7.0-1.el8_10
  3. Upgrade

    Upgrade rocky-linux/firefox-debugsource to a version that resolves this vulnerability.

    Fixed in 0:153.7.0-1.el8_10

Event History

Nov 13, 2026
Advisory Published
via OSV·06:01 AM
Data Sourced
via OSV·06:01 AM
DescriptionSeverityAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

Frequently Asked Questions

1

Which Rocky Linux packages are identified by this advisory?

The advisory lists rocky-linux/firefox, rocky-linux/firefox-debuginfo, and rocky-linux/firefox-debugsource. No Thunderbird package is listed in the provided software inventory.

2

What does exploitation require according to the supplied severity vector?

The vector indicates network reachability, no required privileges, and required user interaction. It also rates attack complexity as high.

3

What could a successful exploit impact?

The supplied vector rates confidentiality, integrity, and availability impact as high. The listed flaws include use-after-free issues, sandbox escapes, a privilege escalation, a race condition, and a site-isolation issue.

Company

Resources

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