Mozilla · Firefox · CVE-2026-84141
**Name of the Vulnerable Software and Affected Versions**
Firefox versions prior to 155
Firefox ESR versions prior to 153.2
Thunderbird versions prior to 155
Thunderbird ESR versions prior to 153.2
**Description**
An integer overflow exists within the Graphics: ImageLib component. An integer overflow occurs when an arithmetic operation attempts to create a numeric value that exceeds the maximum size of the integer type used to store it.
**Recommendations**
Update Firefox to version 155.
Update Firefox ESR to version 153.2.
Update Thunderbird to version 155.
Update Thunderbird ESR to version 153.2.