Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues: Update to Mozilla Thunderbird 128.12 MFSA 2025-55, bsc1244670: CVE-2025-6424: Use-after-free in FontFaceSet bmo1966423 CVE-2025-6425: The WebCompat WebExtension shipped exposed a persistent UUID bmo1717672 CVE-2025-6426: No warning wh...

Security Vulnerabilities fixed in Thunderbird 140 — Mozilla

A use-after-free in FontFaceSet resulted in a potentially exploitable crash. An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. Th...

CVE-2025-6426

The CVE-2025-6426 issue affects Firefox for macOS where opening files with the terminal extension did not warn the user. Connected advisories confirm affected products and versions: Firefox before 140 and Firefox ESR before 128.12, Thunderbird before 140 and Thunderbird before 128.12. The root ca...

Security Vulnerabilities fixed in Firefox 140 — Mozilla

A use-after-free in FontFaceSet resulted in a potentially exploitable crash. An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. Th...