Mozilla · Firefox · CVE-2026-4729
**Name of the Vulnerable Software and Affected Versions**
Firefox versions prior to 149
Thunderbird versions prior to 149
**Description**
Memory safety issues exist in Firefox 148 and Thunderbird 148. These bugs demonstrate evidence of memory corruption, and it is presumed that, with sufficient effort, they could potentially be exploited to execute arbitrary code.
**Recommendations**
Update Firefox to version 149 or later.
Update Thunderbird to version 149 or later.