CVE-2026-8389: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.

Affected products

• Mozilla Firefox: before 150.0.3 (fixed in 150.0.3)

Published 2026-05-12. Last modified 2026-07-15.