Litecoin recently faced one of its most serious technical incidents tied to the Mimblewimble Extension Blocks (MWEB) feature, after a validation flaw allowed an attacker to generate an inflated peg-out of approximately 85,034 LTC. The issue was traced to a failure in block connection-level verification, where MWEB input metadata did not properly match the underlying UTXO being spent. While the incident briefly shook confidence in the extension layer, it was ultimately contained through coordinated miner response and rapid protocol fixes. How the MWEB exploit unfolded According to a postmortem released by Litecoin, the exploit began in March 2026 at block height 3,073,882, when an attacker successfully exploited the validation gap.
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