RHSA-2026:0003 — Security Advisory

An update for thunderbird is now available for Red Hat Enterprise Linux 9.6 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):

• firefox: Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146 (CVE-2025-14333)

• firefox: Use-after-free in the WebRTC: Signaling component (CVE-2025-14321)

• firefox: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2025-14325)

• firefox: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2025-14322)

• firefox: Privilege escalation in the Netmonitor component (CVE-2025-14328)

• firefox: Privilege escalation in the Netmonitor component (CVE-2025-14329)

• firefox: Same-origin policy bypass in the Request Handling component (CVE-2025-14331)

• firefox: Privilege escalation in the DOM: Notifications component (CVE-2025-14323)

• firefox: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2025-14330)

• firefox: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2025-14324)

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.