CVE-2025-10532 is a moderate-impact vulnerability in the JavaScript garbage collection component of Firefox and Thunderbird. It affects Firefox versions prior to 143, Firefox ESR versions prior to 140.3, Thunderbird versions prior to 143, and Thunderbird ESR versions prior to 140.3. The flaw involves incorrect boundary conditions that could potentially lead to memory safety issues. This vulnerability is part of a set of memory safety bugs fixed in these releases, which collectively address risks including memory corruption and potential arbitrary code execution.