Litecoin's latest update strengthens MWEB and fixes key network issues.
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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. In a tweet, the Litecoin official X account revealed that Core version 0.21.5.5 is now available.
The Litecoin Core v0.21.5.5, a patch version release, includes important MWEB consensus hardening, node reliability improvements, wallet and mining fixes, and build/test updates. As a result, all node operators and wallet users are strongly encouraged to upgrade ASAP.
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This also avoids including MWEB transactions in candidate blocks when their input and output commitments would sum to zero. The MWEB PMMR rewind corruption was fixed alongside improved MMR file write durability. A transaction index consistency issue was fixed that could occur if writing block data failed after the index commit.suffered a zero-day bug, which 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, not allowing them to be included in the main chain. The Litecoin Core 0.21.5.4 was released shortly after to address the failure. At April's close, a post mortem report was released on the incident.
Litecoin developers identified a critical validation bug in Litecoin's Mimblewimble Extension Block implementation in March 2026. In April, a second attacker or tester attempted to use the same original exploit path. The upgraded nodes rejected the bad block, resulting in a 13-block invalid chain that was later reorged out after upgraded miners coordinated on the valid chain. The root bug has now been fixed.
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