LTC MWEB Vulnerability: 13 Block Reorg and Market Impact
Tech LTC MWEB Vulnerability: 13 Block Reorg and Market Impact The Litecoin network encountered an unexpected security vulnerability over the weekend; the attacker transferred coins to decentralized exchanges using a zero-day flaw in the MimbleWimble Extension Block (MWEB) privacy layer. The network resolved the issue by performing a 13-block reorganization (reorg) that deleted these invalid transactions. The official X account confirmed the incident on Saturday and shared details of the DoS attack affecting mining pools. Miners quickly switched to the error-free blockchain version, preventing the attacker from profiting. 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 DEXs • A 13-block reorg reversed those invalid transactions — they will not… — Litecoin (@litecoin) April 25, 2026 Technical Details of the LTC MWEB Zero-Day Vulnerability MWEB was integrated into Litecoin as an optional privacy feature proposed in 2019. The MimbleWimble protocol enhances privacy by hiding transaction amounts and addresses, but the zero-day bug allowed invalid peg-out transactions on old nodes. With an average block time of 2.5 minutes, the 13-block reorg rewrote approximately 32.5 minutes of chain. The attacker aimed to produce orphan blocks by disrupting