Critical Memory Safety Bug, Other Severe Vulns Fixed in Thunderbird

A critical memory safety bug has been discovered in Thunderbird 115.0 and Thunderbird 102.13 ( CVE-2023-4056 ). Due to the severity of this vulnerability's threat to the confidentiality, integrity, and availability of impacted systems, it has received a National Vulnerability Database base score of 9.8 out of 10. Other severe vulnerabilities have also been found in Thunderbird, including improper validation of the Text Direction Override Unicode Character in filenames ( CVE-2023-3417 ) and copying of an untrusted input stream to a stack buffer without checking its size ( CVE-2023-4050 ).