CVE-2024-9400: Mozilla Firefox

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

A potential memory corruption vulnerability could be triggered if an attacker had the ability to trigger an OOM at a specific moment during JIT compilation. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Thunderbird < 128.3, and Thunderbird < 131.

Affected products

• Mozilla Firefox: before 128.3.0 (fixed in 128.3.0); before 131.0 (fixed in 131.0)
• Mozilla Thunderbird: before 128.3.0 (fixed in 128.3.0); from 129.0, before 131.0 (fixed in 131.0)

Published 2024-10-01. Last modified 2026-06-17.