Litecoin (LTC) Suffers Chain Reorganization After Coordinated MWEB Attack

Key Takeaways A sophisticated vulnerability in Litecoin’s network led to a 13-block blockchain reorganization over the weekend The MimbleWimble Extension Block (MWEB) privacy feature was compromised, enabling attackers to process fraudulent transactions Coordinated denial-of-service attacks targeted mining pools with updated software, temporarily reducing their network control Evidence points to pre-planned coordination, including funding from a Binance-linked address While the vulnerability is now resolved and legitimate transactions remain intact, trading platforms suffered losses totaling approximately $600,000, particularly on NEAR Intents Over the weekend, Litecoin experienced a significant security breach when malicious actors leveraged an undisclosed vulnerability within its MimbleWimble Extension Block privacy feature to execute the first successful attack on this system since its 2022 deployment. Litecoin update: • A zero-day bug caused a DoS attack that disrupted major mining pools.• Non-updated mining nodes allowed an invalid MWEB transaction allowing them to peg out coins to third party DEX’s• A 13-block reorg reversed those invalid transactions — they will not… — Litecoin (@litecoin) April 25, 2026 The security flaw enabled legacy mining nodes to authenticate fraudulent transactions, allowing bad actors to extract coins from the privacy layer and redirect them toward decentralized exchanges and cross-chain bridging services. Simultaneously, mining operations running current software versions faced coordinated denial-of-service interference. This tactical assault temporarily diminished their computational power, allowing outdated nodes to assume network dominance. When the denial-of-service interference ceased, modernized nodes reclaimed authority and initiated a 13-block chain reorganization. This action nullified the fraudulent transactions, erasing more than three hours of compromised blockchain history from Litecoin’s permanent record. The Litecoi...