RHSA-2025:13651 — Security Advisory

An update for thunderbird is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions, and Red Hat Enterprise Linux 8.6 Telecommunications Update Service.

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):

• firefox: thunderbird: Large branch table could lead to truncated instruction (CVE-2025-8028)

• firefox: thunderbird: Memory safety bugs (CVE-2025-8035)

• firefox: thunderbird: Incorrect URL stripping in CSP reports (CVE-2025-8031)

• firefox: thunderbird: JavaScript engine only wrote partial return value to stack (CVE-2025-8027)

• firefox: thunderbird: Potential user-assisted code execution in ?Copy as cURL? command (CVE-2025-8030)

• firefox: Memory safety bugs (CVE-2025-8034)

• firefox: thunderbird: Incorrect JavaScript state machine for generators (CVE-2025-8033)

• firefox: thunderbird: XSLT documents could bypass CSP (CVE-2025-8032)

• firefox: thunderbird: javascript: URLs executed on object and embed tags (CVE-2025-8029)

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.