RHSA-2021:3839 — Security Advisory

An update for thunderbird is now available for Red Hat Enterprise Linux 8.2 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Mozilla Thunderbird is a standalone mail and newsgroup client.

This update upgrades Thunderbird to version 91.2.0.

Security Fix(es):

• Mozilla: Use-after-free in MessageTask (CVE-2021-38496)

• Mozilla: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2 (CVE-2021-38500)

• Mozilla: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2 (CVE-2021-38501)

• Mozilla: Downgrade attack on SMTP STARTTLS connections (CVE-2021-38502)

• rust-crossbeam-deque: race condition may lead to double free (CVE-2021-32810)

• Mozilla: Validation message could have been overlaid on another origin (CVE-2021-38497)

• Mozilla: Use-after-free of nsLanguageAtomService object (CVE-2021-38498)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.