Gate News message, April 26 — Litecoin experienced a deep chain reorganization (reorg) on Saturday after attackers exploited a zero-day vulnerability in its MimbleWimble Extension Block (MWEB) privacy layer, according to the Litecoin Foundation. The reorg spanned blocks 3,095,930 to 3,095,943 and took over three hours to complete.
The vulnerability allowed mining nodes running older software to validate invalid MWEB transactions, enabling attackers to peg coins out of the privacy extension and route them to third-party decentralized exchanges. Major mining pools were simultaneously targeted with denial-of-service attacks exploiting the same flaw. According to Aurora Labs CEO Alex Shevchenko, attackers performed double-spend attacks against multiple cross-chain swapping protocols during the reorganization window. NEAR Intents reported exposure of approximately $600,000 from the incident.
The Litecoin Foundation confirmed that all offending transactions have been erased from the blockchain while valid transactions during the period remain unaffected. The vulnerability has been fully patched. LTC traded near $56 on Saturday evening, down approximately 1% on the day, with no immediate market reaction to the disclosure. The token is down nearly 25% year-to-date. This marks the first known attack targeting MWEB since its activation via soft fork in May 2022.
The incident occurs amid elevated security concerns in crypto, with DeFi protocols suffering over $750 million in losses to exploits through mid-April 2026, including the $292 million Kelp DAO bridge drain on April 19 and a $285 million attack on Drift on April 1. Cross-chain infrastructure has been a common attack surface in recent incidents.
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