RHSA-2026:47105 — Security Advisory

An update for firefox is now available for Red Hat Enterprise Linux 8.

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

Security Fix(es):

• libaom: libaom: heap buffer overflow in AV1 encoder first-pass stats buffer via LAP mode (CVE-2026-56208)

• firefox: thunderbird: Site isolation issue in the DOM: Navigation component (CVE-2026-15719)

• firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-15718)

• firefox: thunderbird: Mitigation bypass in the Enterprise Policies component (CVE-2026-16390)

• firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: cubeb component (CVE-2026-16350)

• firefox: thunderbird: Information disclosure in the Storage: IndexedDB component (CVE-2026-16391)

• firefox: thunderbird: Site isolation issue in the Networking: HTTP component (CVE-2026-16375)

• firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16356)

• firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-16363)

• firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153 (CVE-2026-16412)

• firefox: thunderbird: Same-origin policy bypass in the Networking: DNS component (CVE-2026-16381)

• firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-16355)

• firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13 (CVE-2026-16361)

• firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16352)

• firefox: thunderbird: Incorrect boundary conditions in the JavaScript: WebAssembly component (CVE-2026-16368)

• firefox: thunderbird: Mitigation bypass in the PDF Viewer component (CVE-2026-16377)

• firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38, Firefox ESR 140.13 and Firefox 153 (CVE-2026-16360)

• firefox: thunderbird: Use-after-free in the WebRTC: Audio/Video component (CVE-2026-16362)

• firefox: thunderbird: Site isolation issue in the Graphics: WebRender component (CVE-2026-16358)

• firefox: thunderbird: Site isolation issue in the Networking component (CVE-2026-16387)

• firefox: thunderbird: Same-origin policy bypass in the DOM: Navigation component (CVE-2026-16349)

• firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-16357)

• firefox: thunderbird: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-16351)

• firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-16371)

• firefox: thunderbird: Privilege escalation in the DOM: Content Processes component (CVE-2026-16379)

• firefox: thunderbird: Information disclosure in the Graphics: ImageLib component (CVE-2026-16354)

• firefox: thunderbird: Information disclosure in the Framework component in DevTools (CVE-2026-16374)

• firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-16359)

• firefox: thunderbird: Mitigation bypass in the DOM: Networking component (CVE-2026-16383)

• firefox: thunderbird: Integer overflow in the JavaScript: WebAssembly component (CVE-2026-16369)

• firefox: thunderbird: Invalid pointer in the DOM: Bindings (WebIDL) component (CVE-2026-16353)

• firefox: thunderbird: Privilege escalation in WebExtensions (CVE-2026-16396)

• firefox: thunderbird: Information disclosure in the Networking: WebSockets component (CVE-2026-16405)

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.