CVE-2025-11708: Mozilla Firefox

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

Use-after-free in MediaTrackGraphImpl::GetInstance(). This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.

Affected products

• Mozilla Firefox: before 140.4.0 (fixed in 140.4.0); before 144.0 (fixed in 144.0)
• Mozilla Thunderbird: before 140.4.0 (fixed in 140.4.0); from 141.0, before 144.0 (fixed in 144.0)

Published 2025-10-14. Last modified 2026-06-17.