Litecoin MWEB Security Incident Postmortem Project Announcements

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The actor later cooperated by signing a recovery transaction that returned the funds except for an agreed 850 LTC bounty. Because this metadata was not fully revalidated during block connection, a malicious block could make a small MWEB input appear to support a much larger pegout. The bug allowed a block producer to construct a mined block containing an MWEB input whose supplied metadata did not match the actual MWEB UTXO being spent. Price stability in AUD terms for reliable value in in-game spending.
But the April attacker’s block also triggered the mutated-block handling problem. The March fix prevented upgraded miners from accepting the malformed MWEB input. A new functional test covered the case where a mutated P2P MWEB block should not prevent later submitblock mining.
In effect, the network carried forward the historical exploit block but neutralized its economic effect. This restored the relationship between MWEB’s internal supply accounting and the transparent-chain value backing MWEB, while preventing the rebalancing output from being spent. Once the actor returned the funds, simply holding or burning transparent LTC was not enough to make MWEB accounting internally consistent.
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After the actor returned the funds minus the agreed bounty, Charlie purchased the additional 850 LTC needed to make the amount whole. Some ecosystem services were not prepared for a deep Litecoin reorg involving invalid-chain activity. The initial emergency fix required careful miner-only deployment and explicit instructions not to reindex. The rebalancing peg-in was mined in a block with only one MWEB output, which made the final frozen MWEB output cleanly identifiable. The signed recovery transaction avoided a more disruptive recovery path.
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The March fix made the original malformed MWEB input invalid for new blocks. Exact third-party transaction IDs and final loss amounts are still being collected. This meant upgraded mining nodes became stuck or unable to continue normal mining operations.