CVE-2025-14326: Mozilla Firefox

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Use-after-free in the Audio/Video: GMP component. This vulnerability was fixed in Firefox 146 and Thunderbird 146.

Affected products

• Mozilla Firefox: before 146.0 (fixed in 146.0)
• Mozilla Thunderbird: before 146.0 (fixed in 146.0)

Published 2025-12-09. Last modified 2026-10-07.