AlmaLinux alert ALSA-2026:12285 (thunderbird)

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[Announce]  [Security Advisory] ALSA-2026:12285: thunderbird security update (Important)
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Sun, 03 May 2026 20:01:27 +0000
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<0100019def6e7958-0d6a9e25-eba9-4f42-884d-ffc182d809b9-000000@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: 10
Type: Security
Severity: Important
Release date: 2026-05-03

Summary:

Mozilla Thunderbird is a standalone mail and newsgroup client.  

Security Fix(es):  

  * firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS
(CVE-2026-6772)
  * firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-6754)
  * firefox: thunderbird: Spoofing issue in the DOM: Core & HTML component (CVE-2026-6762)
  * firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6752)
  * firefox: thunderbird: Other issue in the Storage: IndexedDB component (CVE-2026-6770)
  * firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component
(CVE-2026-6757)
  * firefox: thunderbird: Other issue in the Libraries component in NSS (CVE-2026-6767)
  * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10,
Firefox 150 and Thunderbird 150 (CVE-2026-6786)
  * firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6753)
  * firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-6759)
  * firefox: thunderbird: Use-after-free in the WebRTC component (CVE-2026-6747)
  * firefox: thunderbird: Information disclosure due to uninitialized memory in the Graphics:
Canvas2D component (CVE-2026-6749)
  * firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS
(CVE-2026-6766)
  * firefox: thunderbird: Privilege escalation in the Networking component (CVE-2026-6761)
  * firefox: thunderbird: Mitigation bypass in the File Handling component (CVE-2026-6763)
  * firefox: thunderbird: Privilege escalation in the Graphics: WebRender component
(CVE-2026-6750)
  * firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component
(CVE-2026-6748)
  * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10,
Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 (CVE-2026-6785)
  * firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-6771)
  * firefox: thunderbird: Incorrect boundary conditions in the DOM: Device Interfaces component
(CVE-2026-6764)
  * firefox: thunderbird: Information disclosure in the Form Autofill component (CVE-2026-6765)
  * firefox: thunderbird: Privilege escalation in the Debugger component (CVE-2026-6769)
  * firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component
(CVE-2026-6751)
  * firefox: thunderbird: Incorrect boundary conditions in the WebRTC: Networking component
(CVE-2026-6776)
  * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-6746)


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/10/ALSA-2026-12285.html

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AlmaLinux Team
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