A Tale of Two Leaks: How Hackers Breached the Great Firewall of China

Venue: 39th Chaos Communication Congress (39C3)

Date: December 27, 2025

Examining two significant security incidents involving China's internet filtering infrastructure: Wallbleed, a memory disclosure vulnerability in DNS injection systems that exposed over 2 million HTTP cookies and nearly 27,000 passwords, and a subsequent leak of 600GB of source code from Geedge Networks, a censorship software company.