CVE-2026-92014: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 0.2% chance of exploitation in the next 30 days.

Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox ESR 115.41, Firefox ESR 140.16, and Thunderbird 140.16.

Affected products

• Mozilla Firefox: before 115.41.0 (fixed in 115.41.0); from 116.0, before 140.16.0 (fixed in 140.16.0)
• Mozilla Thunderbird: before 140.16.0 (fixed in 140.16.0)

Published 2026-09-15. Last modified 2026-10-06.