Security Vulnerabilities fixed in Thunderbird 68.9.0 — Mozilla

NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys.
When browsing a malicious page, a race condition in our SharedWorkerService could occur and lead to a potentially exploitable crash.
Mozilla developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting in a crash. We presume that with enough effort that it could be exploited to run arbitrary code.
Mozilla developers Tom Tung and Karl Tomlinson reported memory safety bugs present in Firefox 68.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
If Thunderbird is configured to use STARTTLS for an IMAP server, and the server sends a PREAUTH response, then Thunderbird will continue with an unencrypted connection, causing email data to be sent without protection.