Red Hat Security Advisory 2021-3839-01 - Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 91.2.0. Issues addressed include double free and use-after-free vulnerabilities.
df42751e3fccd0c823c188f062a5cac14fc8e08ca7e9a0ed6b006e9653e7b9f8