Thunderbird Security Update — AlmaLinux 8 (ALSA-2026:22643)

ALSA-2026:22643 updates Thunderbird on AlmaLinux 8, fixing CVE-2026-8388, CVE-2026-8391, CVE-2026-8401, CVE-2026-8956, CVE-2026-8975, CVE-2026-8955, CVE-2026-8968, CVE-2026-8957 and further engine flaws — JIT boundary-condition issues, sandbox-escape and memory-safety classes, aggregate CVSS 6.5 (CWE-119). Update with dnf update thunderbird and restart the client.

High 6.5 CVSS 2026-11-06

AlmaLinux 8

SharedLicense लाइसेंस के तहत इसका अर्थ

The batch includes JIT boundary-condition and sandbox-escape fixes — the chain from crafted email content to code execution in the mail client runs through exactly those engine components.

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.

अक्सर पूछे जाने वाले प्रश्न

What is ALSA-2026:22643?

It is AlmaLinux's Thunderbird erratum for AlmaLinux 8, fixing CVE-2026-8388, CVE-2026-8391, CVE-2026-8401, CVE-2026-8956, CVE-2026-8975, CVE-2026-8955, CVE-2026-8968, CVE-2026-8957 and further engine flaws — JIT boundary conditions, sandbox escapes and memory-safety issues, aggregate CVSS 6.5 (CWE-119).

Who is affected?

AlmaLinux 8 desktops and workstations running Thunderbird — the flaws trigger on rendering malicious email content.

How do I apply the fix?

Run dnf update thunderbird and restart the client; verify the updated version in its About dialog.

Why do JIT and sandbox fixes matter for a mail client?

Thunderbird renders HTML mail with the same engine class as the browser — JIT boundary flaws and sandbox escapes in that engine are the standard crafted-email-to-code-execution chain.

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