RHSA-2025:21841 — 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: Mitigation bypass in the DOM: Security component (CVE-2025-13018)

• firefox: Use-after-free in the Audio/Video component (CVE-2025-13014)

• firefox: Incorrect boundary conditions in the JavaScript: WebAssembly component (CVE-2025-13016)

• firefox: Same-origin policy bypass in the DOM: Workers component (CVE-2025-13019)

• firefox: Use-after-free in the WebRTC: Audio/Video component (CVE-2025-13020)

• firefox: Race condition in the Graphics component (CVE-2025-13012)

• firefox: Spoofing issue in Firefox (CVE-2025-13015)

• firefox: Mitigation bypass in the DOM: Core & HTML component (CVE-2025-13013)

• firefox: Same-origin policy bypass in the DOM: Notifications component (CVE-2025-13017)

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.