Litecoin experienced a significant chain reorganization after attackers exploited a zero-day vulnerability tied to its MimbleWimble Extension Block (MWEB) privacy feature. The Litecoin Foundation confirmed that the exploit allowed invalid transactions to be validated by mining nodes running outdated software, enabling unauthorized coin movements from the privacy layer to the main chain.
The attack forced a 13-block reorganization covering blocks 3,095,930 through 3,095,943, a process that took more than three hours to complete. During that period, attackers also launched denial-of-service attacks against major mining pools, increasing network disruption.
Double-Spend Attempts Target Cross-Chain Swap Protocols
According to Alex Shevchenko of Aurora Labs, the incident appeared to be a coordinated attack that enabled double-spend attempts across several cross-chain swap platforms. Some trading venues reported financial losses after accepting transactions later removed from the canonical blockchain history.
One affected system, NEAR Intents, reported exposure estimated at approximately $600,000. The attackers used the fork window to exploit cross-chain infrastructure, a growing risk area in decentralized finance ecosystems.
Patch Released as Market Shows Limited Immediate Reaction
The Litecoin Foundation stated that the vulnerability has now been fully patched and that invalid transactions were erased from the blockchain history, while legitimate transactions remained intact. This marks the first confirmed attack targeting MWEB since it was introduced through a soft fork in May 2022.
Despite the seriousness of the exploit, Litecoin traded near $56 following the announcement, showing limited immediate market reaction. The incident adds to a broader trend of rising crypto security breaches, with decentralized finance protocols losing more than $750 million to exploits in 2026 through mid-April, including major cross-chain attacks earlier in the year.
Disclaimer
This content is for informational purposes only and does not constitute financial, investment, or legal advice. Cryptocurrency trading involves risk and may result in financial loss.