CVE-2026-84140

Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2...

CVE-2026-84138

CVE-2026-84138 is a denial-of-service vulnerability in the PDF Viewer component of Mozilla Firefox and Thunderbird . It was fixed in Firefox 155 and Thunderbird 155 (also in Firefox ESR 115.40, 140.15, 153.2, and Thunderbird 140.15, 153.2 per the associated Nessus plugins). The NVD rates it CVSS ...

CVE-2026-84126

CVE-2026-84126 is a vulnerability in the Layout: Grid component of Firefox , caused by incorrect boundary conditions . The flaw allows a network-based attack with low complexity and no required privileges , but user interaction is required (e.g., visiting a crafted page). The impact is limited to...