RHSA-2025:15437 — Security Advisory

An update for thunderbird is now available for Red Hat Enterprise Linux 8.2 Advanced 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):

• firefox: thunderbird: Denial-of-service due to out-of-memory in the Graphics: WebRender component (CVE-2025-9182)

• thunderbird: firefox: Sandbox escape due to invalid pointer in the Audio/Video: GMP component (CVE-2025-9179)

• thunderbird: firefox: Same-origin policy bypass in the Graphics: Canvas2D component (CVE-2025-9180)

• thunderbird: firefox: Uninitialized memory in the JavaScript Engine component (CVE-2025-9181)

• thunderbird: firefox: Memory safety bugs fixed in Firefox ESR 115.27, Firefox ESR 128.14, Thunderbird ESR 128.14, Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142 (CVE-2025-9185)

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.