Mozilla · Thunderbird · CVE-2026-4723
**Name of the Vulnerable Software and Affected Versions**
Firefox versions prior to 149
Thunderbird versions prior to 149
**Description**
A use-after-free issue exists in the JavaScript Engine component. This condition may allow for unexpected behavior.
**Recommendations**
Update Firefox to version 149 or later.
Update Thunderbird to version 149 or later.