On August 12, 2025, the Monero (XMR) cryptocurrency network experienced a 51% attack, reportedly orchestrated by the Qubic mining pool, which temporarily seized control of the majority of Monero's hashrate. This allowed Qubic to execute a six-block deep blockchain reorganization, potentially enabling double-spend attacks, transaction censorship, and rewriting of blockchain history. The incident led to a sharp decline in Monero's price, with drops reported between 7% and 15%, resulting in a market capitalization loss exceeding $300 million despite a broader cryptocurrency market rally. Qubic described the takeover as a planned experiment, though the exact economic benefits remain unclear and experts remain skeptical about the motivations. Following the attack, other miners coordinated efforts to reduce Qubic's control to under 14%. The event has raised concerns over the security and privacy of the Monero network and the broader implications for blockchain integrity. Additionally, on August 10, 2025, a related but separate incident involved an exploit of the Numamoney platform, resulting in a loss of approximately $313,000.