CVE-2022-45406: Mozilla Firefox

Critical severity, CVSS 9.8. EPSS: 1.1% chance of exploitation in the next 30 days.

If an out-of-memory condition occurred when creating a JavaScript global, a JavaScript realm may be deleted while references to it lived on in a BaseShape. This could lead to a use-after-free causing a potentially exploitable crash. This vulnerability affects Firefox ESR < 102.5, Thunderbird < 102.5, and Firefox < 107.

Affected products

• Mozilla Firefox: before 107.0 (fixed in 107.0)
• Mozilla Firefox ESR: before 102.5 (fixed in 102.5)
• Mozilla Thunderbird: before 102.5 (fixed in 102.5)

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