ALSA-2026:27734

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.

Security Fix(es):

• firefox: thunderbird: Sandbox escape in the DOM: Workers component (CVE-2026-12294)
• firefox: thunderbird: Information disclosure, sandbox escape in the Security: Process Sandboxing component (CVE-2026-12313)
• firefox: thunderbird: Information disclosure, sandbox escape in the Security: Process Sandboxing component (CVE-2026-12311)
• firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12290)
• firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152 (CVE-2026-12327)
• firefox: thunderbird: JIT miscompilation in the DOM: Core & HTML component (CVE-2026-12299)
• firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12329)
• firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12312)
• firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-12302)
• firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152 (CVE-2026-12328)
• firefox: thunderbird: Incorrect boundary conditions in the Internationalization component (CVE-2026-12330)
• firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12314)
• firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12309)
• firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12310)
• firefox: thunderbird: Denial-of-service in the Graphics: ImageLib component (CVE-2026-12325)
• firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-12295)
• firefox: thunderbird: Privilege escalation in the Graphics: WebRender component (CVE-2026-12289)
• firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-12315)
• firefox: thunderbird: Sandbox escape in the Security: Process Sandboxing component (CVE-2026-12296)
• firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12306)
• firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12307)
• firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Networking component (CVE-2026-12297)
• firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12305)
• firefox: thunderbird: Incorrect boundary conditions in the Web Audio component (CVE-2026-12292)
• firefox: thunderbird: Memory safety bug fixed in Thunderbird ESR 140.12 (CVE-2026-12308)
• firefox: thunderbird: Incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-12324)
• firefox: thunderbird: Same-origin policy bypass in the Networking: Cookies component (CVE-2026-12304)
• firefox: thunderbird: Use-after-free in the Networking: HTTP component (CVE-2026-12291)
• firefox: thunderbird: Memory safety bug fixed in Firefox ESR 140.12 (CVE-2026-12298)

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.