AlmaLinux alert ALSA-2026:27734 (firefox)

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[Announce]  [Security Advisory] ALSA-2026:27734: firefox security update (Important)
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Tue, 23 Jun 2026 16:23:02 +0000
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<0100019ef54ad353-a3879ed6-7b70-435e-b193-63afbd20642f-000000@email.amazonses.com>
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Article
Hi,

You are receiving an AlmaLinux Security update email because you subscribed to receive errata
notifications from AlmaLinux.

AlmaLinux: 9
Type: Security
Severity: Important
Release date: 2026-06-23

Summary:

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

Security Fix(es):  

  * firefox: thunderbird: Sandbox escape in the DOM: Workers component (CVE-2026-12294)
  * firefox: thunderbird: Information disclosure, sandbox escape in the Security: Process
Sandboxing component (CVE-2026-12313)
  * firefox: thunderbird: Information disclosure, sandbox escape in the Security: Process
Sandboxing component (CVE-2026-12311)
  * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12290)
  * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.12, Thunderbird ESR 140.12,
Firefox 152 and Thunderbird 152 (CVE-2026-12327)
  * firefox: thunderbird: JIT miscompilation in the DOM: Core & HTML component (CVE-2026-12299)
  * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12329)
  * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12312)
  * firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-12302)
  * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12,
Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152 (CVE-2026-12328)
  * firefox: thunderbird: Incorrect boundary conditions in the Internationalization component
(CVE-2026-12330)
  * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12314)
  * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12309)
  * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12310)
  * firefox: thunderbird: Denial-of-service in the Graphics: ImageLib component (CVE-2026-12325)
  * firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-12295)
  * firefox: thunderbird: Privilege escalation in the Graphics: WebRender component
(CVE-2026-12289)
  * firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-12315)
  * firefox: thunderbird: Sandbox escape in the Security: Process Sandboxing component
(CVE-2026-12296)
  * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12306)
  * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12307)
  * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Networking
component (CVE-2026-12297)
  * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12305)
  * firefox: thunderbird: Incorrect boundary conditions in the Web Audio component
(CVE-2026-12292)
  * firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12308)
  * firefox: thunderbird: Incorrect boundary conditions in the Graphics: CanvasWebGL component
(CVE-2026-12324)
  * firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component
(CVE-2026-12304)
  * firefox: thunderbird: Use-after-free in the Networking: HTTP component (CVE-2026-12291)
  * firefox: thunderbird: Memory safety bug fixed in Firefox ESR 140.12 (CVE-2026-12298)


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.


Full details, updated packages, references, and other related information:
https://errata.almalinux.org/9/ALSA-2026-27734.html

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AlmaLinux Team
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