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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2018-18512
• https://bugzilla.mozilla.org/show_bug.cgi?id=1482659
• https://www.mozilla.org/security/advisories/mfsa2019-03/