RHSA-2025:4027 — Security Advisory

An update for thunderbird is now available for Red Hat Enterprise Linux 9.2 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.

Security Fix(es):

• thunderbird: Use-after-free triggered by XSLTProcessor (CVE-2025-3028)

• thunderbird: URL Bar Spoofing via non-BMP Unicode characters (CVE-2025-3029)

• thunderbird: Memory safety bugs fixed in Thunderbird 137 and Thunderbird 128.9 (CVE-2025-3030)

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.