Mozilla · Thunderbird · CVE-2026-109730
**Name of the Vulnerable Software and Affected Versions**
Firefox versions prior to 158
Firefox ESR versions prior to 115.43
Firefox ESR versions prior to 153.5
Thunderbird versions prior to 158
Thunderbird versions prior to 153.5
**Description**
An integer overflow exists within the Graphics component. An integer overflow occurs when an arithmetic operation attempts to create a numeric value that is outside of the range that can be represented with a given number of bits.
**Recommendations**
Update Firefox to version 158 or later.
Update Firefox ESR to version 115.43 or later.
Update Firefox ESR to version 153.5 or later.
Update Thunderbird to version 158 or later.
Update Thunderbird to version 153.5 or later.