Security updates were released for Chrome, Firefox, and Thunderbird On May 28, 2025, to patch several vulnerabilities, including some rated critical. A major issue in Firefox and Thunderbird involves a memory corruption bug in the libvpx encoder used for WebRTC, which could lead to crashes or exploitation. Mozilla classified it as critical, though CISA rated it high with a CVSS score of 7.5. Affected versions include Firefox 139, ESR 128.11/115.24, and Thunderbird 139/128.11. Chrome’s update fixes eight security flaws, including high-risk "use-after-free" and memory boundary issues in the V8 JavaScript engine. Users are urged to update their browsers promptly.