Multiple memory safety vulnerabilities, including use-after-free bugs in the Graphics: Canvas2D component, affect Firefox versions prior to 143 and Firefox ESR prior to 140.3, as well as Thunderbird versions prior to 143 and Thunderbird ESR prior to 140.3. These bugs could lead to sandbox escapes and arbitrary code execution. Mozilla has fixed these issues in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird ESR 140.3.