Litecoin Shares Update on Zero Day Exploit: What Happened?

Cover image via U.Today Disclaimer: The opinions expressed by our writers are their own and do not represent the views of U.Today. The financial and market information provided on U.Today is intended for informational purposes only. U.Today is not liable for any financial losses incurred while trading cryptocurrencies. Conduct your own research by contacting financial experts before making any investment decisions. We believe that all content is accurate as of the date of publication, but certain offers mentioned may no longer be available. Litecoin is currently in the spotlight following reports of a potential zero-day exploit, sparking concerns in the crypto community. In light of this, Litecoin developers have issued an update outlining what happened. In a five-point tweet, Litecoin's official X account outlined the sequence of events in the incident. Advertisement Litecoin stated that a zero-day bug caused a DoS attack that disrupted major mining pools. Subsequently, non-updated mining nodes allowed an invalid MWEB transaction, allowing them to peg out coins to third-party DEXs. A 13-block reorg reversed the invalid transactions and they will not be included in the main chain. The Litecoin team stated that all valid transactions during that period were unaffected. 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… HOT Stories Ripple CEO Wins Prestigious Harvard Business Award Crypto Regulation 2026: U.S. Outlook — Litecoin (@litecoin) April 25, 2026 The bug has now been fully patched, and the Litecoin network continues to operate normally. A new core version was released subsequently, including important security updates. Advertisement You Might Also Like Sun, 04/26/2026 - 09:04 Why XRP Ledger is Immune to the Zero-Day Attack Unlike Litecoin, Top XRPL Contributor Explains By Gamza Khanzadaev A 51% attack is regarded as an original threat to blockchain security, especially for proof-of-work blockchains, which include Litecoin. This is made possible by the fact that blockchain consensus algorithms essentially implement majority rule. If an attacker controls over 50% of the hashrate of a PoW blockchain, they can create new blocks faster than the rest of the network combined. In August 2025, Monero saw an attempted 51% attack, with Qubic mining pool performing a six-block deep reorganization of the Monero ledger and orphaning around 60 blocks. Advertisement New Litecoin update released Shortly after it provided an update on the incident, Litecoin announced a new Core version 0.21.5.4 release, which includes important security updates. It urges all node operators and wallet users to upgrade as soon as possible. You Might Also Like Fri, 03/13/2026 - 16:02 Litecoin Halving Set for Next 500 Days, Will Lower Rewards Lift LTC Price? By Tomiwabold Olajide The release contains fixes for highlighted security issues and corrects MWEB input/output accounting going forward and is a required upgrade for all node operators, miners, and wallet users. It prevents kernel fee overflow during MWEB transaction validation and erases block data for mutated blocks to avoid miner DoS. Miners no longer include MWEB transactions when the input and output commitments in the block would sum to zero. #Litecoin News #Litecoin