AlmaLinux alert ALSA-2026:21381 (thunderbird)

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[Announce]  [Security Advisory] ALSA-2026:21381: thunderbird security update (Important)
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Fri, 29 May 2026 14:05:48 +0000
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<0100019e740e3566-0615c34c-f519-4b1a-b829-3f154f692646-000000@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: 2026-05-29

Summary:

Mozilla Thunderbird is a standalone mail and newsgroup client.  

Security Fix(es):  

  * firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component
(CVE-2026-8388)
  * firefox: Other issue in the JavaScript Engine component (CVE-2026-8391)
  * firefox: Sandbox escape in the Profile Backup component (CVE-2026-8401)
  * firefox: Integer overflow in the Networking: JAR component (CVE-2026-8956)
  * firefox: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151
(CVE-2026-8975)
  * firefox: Privilege escalation in the DOM: Workers component (CVE-2026-8955)
  * firefox: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component
(CVE-2026-8968)
  * firefox: Incorrect boundary conditions, integer overflow in the Audio/Video component
(CVE-2026-8954)
  * firefox: Information disclosure, sandbox escape in the Security: Process Sandboxing component
(CVE-2026-8958)
  * firefox: Incorrect boundary conditions in the Audio/Video: Web Codecs component
(CVE-2026-8946)
  * firefox: Privilege escalation in the Security component (CVE-2026-8970)
  * firefox: Same-origin policy bypass in the Networking: HTTP component (CVE-2026-8950)
  * firefox: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151 (CVE-2026-8974)
  * firefox: Sandbox escape due to use-after-free in the Disability Access APIs component
(CVE-2026-8953)
  * firefox: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component
(CVE-2026-8959)
  * firefox: Spoofing issue in the Form Autofill component (CVE-2026-8961)
  * firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-8947)
  * firefox: Mitigation bypass in the DOM: Security component (CVE-2026-8962)
  * firefox: Privilege escalation in the Enterprise Policies component (CVE-2026-8957)


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-2026-21381.html

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AlmaLinux Team
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