CVE-2026-100763: Mozilla Firefox

Critical severity, CVSS 9.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

Affected products

• Mozilla Firefox
• Mozilla Thunderbird

Published 2026-09-29. Last modified 2026-10-01.