CVE-2026-4725: Mozilla Firefox

Critical severity, CVSS 10.0. EPSS: 0.4% chance of exploitation in the next 30 days.

Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

Affected products

• Mozilla Firefox: before 149.0 (fixed in 149.0)

Published 2026-03-24. Last modified 2026-06-17.