CVE-2026-4708: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Affected products

• Mozilla Firefox: before 140.9.0 (fixed in 140.9.0); before 149.0 (fixed in 149.0)

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