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Vulnerabilities

Vulnerability · ALSA-2026:80674

Important: thunderbird security update

Published Oct 12, 2026 · catalog updated Oct 26, 2026 · Important: thunderbird security update

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Open the advisory

Exploitation likelihood is not on this record for ALSA-2026:80674. A missing EPSS score is not a low risk. Compare Important: thunderbird security update with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Important: thunderbird security update).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Advisory link
Affected products
AlmaLinux:10 thunderbird

Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fix(es): * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100832) * firefox: Use-after-free in the Layout: Text and Fonts component (CVE-2026-100784) * firefox: thunderbird: Privilege escalation in the DLL Services component (CVE-2026-100801) * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Internationalization component (CVE-2026-100794) * firefox: thunderbird: Privilege escalation in the Address Bar component (CVE-2026-100820) * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100777) * firefox: thunderbird: Information disclosure in the Networking: JAR component (CVE-2026-100766) * firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100779) * firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-100807) * firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-100792) * firefox: Privilege escalation due to use-after-free in the Graphics: WebRender component (CVE-2026-100797) * firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the XPCOM component (CVE-2026-100819) * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100776) * firefox: thunderbird: Use-after-free in the Widget component (CVE-2026-100757) * firefox: Sandbox escape due to use-after-free in the Graphics component (CVE-2026-100786) * firefox: thunderbird: Information disclosure in the Networking component (CVE-2026-96869) * firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100770) * firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100769) * firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100791) * firefox: thunderbird: Sandbox escape due to use-after-free in the Widget: Gtk c

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • AlmaLinux:10 thunderbird0 → 140.17.0-1.el10_2.alma.1

How to fix ALSA-2026:80674

  • Upgrade

    ALSA-2026:80674 lists a fix boundary at 140.17.0-1.el10_2.alma.1. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 140.17.0-1.el10_2.alma.1

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for ALSA-2026:80674. A missing EPSS score is not a low risk. Compare Important: thunderbird security update with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 0 → 140.17.0-1.el10_2.alma.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 12, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fix(es): * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100832) * firefox: Use-after-free in the Layout: Text and Fonts component (CVE-2026-100784) * firefox: thunderbird: Privilege escalation in the DLL Services component (CVE-2026-100801) * firefox: thunderbird: Sandbox escape due to inc

  2. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    thunderbird fixed in 140.17.0-1.el10_2.alma.1

  3. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    thunderbird fixed in 140.17.0-1.el10_2.alma.1

  4. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fix(es): * firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100832) * firefox: Use-after-free in the Layout: Text and Fonts component (CVE-2026-100784) * firefox: thunderbird: Privilege escalation in the DLL Services component (CVE-2026-100801) * firefox: thunderbird: Sandbox escape due to inc

Sources

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • OpenSSF OSV / OSV ScannerOct 26, 2026