A new stable version of the Thunderbird email client was released on March 23, 2021. Thunderbird 78.9.0 is a bug fix and security update for all stable versions of the e-mail program (Mac, Windows and Linux). The update was released on the same day that the new stable version of Mozilla Firefox was released.

The new version of Thunderbird is already available as a direct download from the official Thunderbird website and as an in-browser update. Choose Help> About Thunderbird to view the installed version and manually check for updates.

Thunderbird 78.9.9 fixes five high and medium severity security issues. High is the second highest rating after critical.

  • CVE-2021-23981: Uploading textures to an unbound backup buffer resulted in an unbound read (HIGH).
  • MOZ-2021-0002: Angular graphics library out of date (HIGH)
  • CVE-2021-23987: Memory security bugs have been fixed in Thunderbird 78.9 (HIGH).
  • CVE-2021-23982: Internal network hosts could be attacked by a malicious …



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