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One of the Oldest Altcoins Hit by a Hacking Incident: Hackers Created Fake Transactions ...

Mexc.Co • April 26, 2026

Litecoin, one of the established projects in the cryptocurrency market, shared an important update regarding a critical security vulnerability discovered in its network. According to the statement, an unknown software bug, described as a “zero-day” error, caused a denial-of-service (DoS) attack on the network, affecting large mining pools.

The Litecoin team stated that outdated mining nodes accepted an invalid MWEB (MimbleWimble Extension Block) transaction due to this vulnerability. It was reported that this error allowed some coins to be transferred to third-party decentralized exchanges (DEX).

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However, a swift response was implemented to secure the network. Litecoin developers announced that a 13-block “reorg” (chain reorganization) was applied to reverse these invalid transactions. This, they added, prevented the erroneous transactions from being included in the main chain.

The statement also noted that valid transactions carried out during this process were not affected, and only erroneous transactions were rolled back. The development team reported that the security vulnerability has been fully patched and the network is currently operating normally.

*This is not investment advice.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Litecoin Faces 13-Block Reorganization Due to Zero-Day Vulnerability Exploitation On April 25, 2026, Litecoin experienced a significant 13-block chain reorganization after attackers exploited a zero-day vulnerability in its MimbleWimble Extension Block (MWEB) protocol. The vulnerability allowed outdated mining nodes to validate invalid MWEB transactions, enabling attackers to peg out coins to third-party decentralized exchanges. This incident resulted in a denial-of-service (DoS) attack that disrupted major mining pools. The Litecoin Foundation confirmed that all invalid transactions during the exploit were reversed and that valid transactions remained unaffected. The vulnerability was patched with the release of Litecoin Core v0.21.5.4 on the same day as the attack began. Security researchers have raised concerns that the consensus vulnerability had been privately patched weeks before the attack, suggesting a lapse in communication about the necessary updates. The incident highlights vulnerabilities in proof-of-work networks where miners may run outdated software. The network is currently operating normally after the patch. 24 sources 70

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One of the Oldest Altcoins Hit by a Hacking Incident: Hackers Created Fake Transactions ...

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