CVE-2025-13026 is a critical sandbox escape vulnerability in the Graphics: WebGPU component of Firefox versions prior to 145. It arises from incorrect boundary conditions that could allow an attacker to break out of the browser's sandbox environment. This vulnerability was fixed in Firefox 145. The issue is part of a set of memory safety bugs addressed in Firefox 145 and Thunderbird 145, some of which showed evidence of memory corruption and potential for arbitrary code execution.