Mozilla Foundation Security Advisory 2025-65 Summary Security vulnerabilities fixed in Firefox ESR 115.27. Key Information CVE-2025-9179: Sandbox escape due to invalid pointer in the Audio/Video: GMP component Impact: High Description: An attacker could perform memory corruption in the GMP process, which processes encrypted media. This process is sandboxed but has different privileges from the content process. Reference: Bug 1979527 CVE-2025-9180: Same-origin policy bypass in the Graphics: Canvas2D component Impact: High Description: Same-origin policy bypass in the Graphics: Canvas2D component. Reference: Bug 1979782 CVE-2025-9185: Memory safety bugs fixed in multiple versions Impact: High Description: Memory safety bugs fixed in Firefox ESR 115.27, Firefox ESR 128.14, Thunderbird ESR 128.14, Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142, and Thunderbird 142. Some of these bugs showed evidence of memory corruption and could have been exploited to run arbitrary code. Reference: Memory safety bugs fixed in Firefox ESR 115.27, Firefox ESR 128.14, Thunderbird ESR 128.14, Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142, and Thunderbird 142