CVE-2022-31740: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days.

On arm64, WASM code could have resulted in incorrect assembly generation leading to a register allocation problem, and a potentially exploitable crash. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

Affected products

• Mozilla Firefox: before 101.0 (fixed in 101.0)
• Mozilla Firefox ESR: before 91.10 (fixed in 91.10)
• Mozilla Thunderbird: before 91.10 (fixed in 91.10)

Published 2022-12-22. Last modified 2026-06-17.