[SECURITY] Fedora 45 Update: firefox-155.0-1.fc45

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

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

A Denial-of-Service (DoS) vulnerability exists in the PDF Viewer component of Firefox and Thunderbird . The vulnerability has been addressed in Firefox 155 and Thunderbird 155 . While specific root cause details are not provided in the documents, the impact is a high availability loss as indicate...

CVE-2026-84136 Other issue in the DOM: Navigation component

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

CVE-2026-84126

The Firefox and Thunderbird browsers are affected by a vulnerability involving incorrect boundary conditions in the Layout: Grid component . The issue has been remediated in Firefox 155 and Thunderbird 155 . While the vulnerability was identified as having a Medium base severity (CVSS 4.3) and a ...