RLSA-2026:27733 Important: firefox security update

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Security Fixes: firefox: thunderbird: Sandbox escape in the DOM: Workers component CVE-2026-12294 firefox: thunderbird: Information disclosure, sandbox escape in the Security: Process...

firefox: thunderbird: Undefined behavior in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Undefined behavior in the DOM: Core & HTML component...

firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component...

CVE-2026-2805

Invalid pointer in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148...

PT-2026-21711

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Firefox ESR versions prior to 115.33 Firefox ESR versions prior to 140.8 Thunderbird versions prior to 148 Thunderbird versions prior to 140.8 Description A flaw exists that allows for a sandbox escape due to...