Litecoin 13-Block Reorg: MWEB Zero-Day Exploit Explained 2026
On April 25, 2026, Litecoin executed a 13-block chain reorganization after a zero-day vulnerability in its MWEB privacy layer enabled fraudulent cross-chain transactions and a coordinated denial-of-service attack on major mining pools. The exploit exposed approximately $600,000 on NEAR Intents and raised hard questions about proof-of-work finality. Here’s exactly what happened, why the “zero-day” label is disputed, and what cross-chain protocols need to change now.
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