CVE-2024-6602: Mozilla Firefox

Critical severity, CVSS 9.8. EPSS: 1% chance of exploitation in the next 30 days.

A mismatch between allocator and deallocator could have led to memory corruption. This vulnerability affects Firefox < 128, Firefox ESR < 115.13, Thunderbird < 115.13, and Thunderbird < 128.

Affected products

• Mozilla Firefox: before 115.13 (fixed in 115.13); before 128.0 (fixed in 128.0)
• Mozilla Thunderbird: before 115.13 (fixed in 115.13); from 116.0, before 128.0 (fixed in 128.0)

Published 2024-07-09. Last modified 2026-06-17.