CVE-2018-18512: Mozilla Thunderbird

Critical severity, CVSS 9.8. EPSS: 1.6% chance of exploitation in the next 30 days.

A use-after-free vulnerability can occur while playing a sound notification in Thunderbird. The memory storing the sound data is immediately freed, although the sound is still being played asynchronously, leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 60.5.

Affected products

• Mozilla Thunderbird: before 65.0 (fixed in 65.0)

Published 2019-04-26. Last modified 2026-06-17.