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Litecoin suffered a deep chain reorganization on Saturday after attackers exploited a zero-day bug tied to its MimbleWimble Extension Block (MWEB) privacy layer, the Litecoin Foundation said.
The Foundation said the bug allowed older mining nodes to accept an invalid MWEB transaction. That acceptance created a fork that lasted more than three hours before the network restored the main chain.
According to the Litecoin Foundation, the incident resulted in Litecoin reversing 13 blocks after the exploit. The Foundation also said valid transactions made during that period were not affected.
Aurora Labs CEO Alex Shevchenko said the affected blocks were 3,095,930 to 3,095,943. He described the event as a “coordinated attack.”
Shevchenko said the 13-block reorganization removed the invalid transactions from Litecoin’s main history.
The Foundation said attackers used the fork window to attempt double-spend transactions against several cross-chain swap protocols. It said these platforms had accepted MWEB peg-outs that later became invalid after the reorganization.
Shevchenko said the exposure for NEAR Intents was around $600k. He also warned trading venues to review Litecoin transactions and balances, adding, “We see a lot of double spend transactions.”
The Litecoin Foundation said the zero-day bug has been fully patched. It did not name the affected mining pools or disclose how much LTC the invalid transactions attempted to create.
The attack is described as the first known major exploit targeting MWEB since Litecoin activated the privacy feature in May 2022. After the disclosure, LTC traded near $56, down about 1% on the day. Some venues reported losses.
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