Litecoin Undergoes Block Reorganization Due to Zero-Day Vulnerability

Litecoin network faced a block reorganization due to a zero-day vulnerability exploited by attackers.

On April 25, the Litecoin network experienced a significant block reorganization after attackers exploited a zero-day vulnerability. 

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…

— Litecoin (@litecoin) April 25, 2026

According to the incident report, the bug enabled unknown parties to conduct a DoS attack, disrupting major mining pools. 

This allowed nodes running outdated software to validate invalid transactions within the MimbleWimble Extension Block privacy layer.

Through these manipulations, the perpetrator could interact with invalid coins and send them to third-party DEX platforms.

In response to the attack, developers carried out a 13-block reorganization, reversing the false transactions and excluding them from the new chain. 

“All valid operations during this period remain unchanged. The bug has been fully fixed, and the network continues to operate normally,” stated Litecoin representatives.

Alex Shevchenko, CEO of Aurora Labs, described the incident as a “coordinated attack.” 

According to his observations, the reorganization affected blocks from #3,095,930 to #3,095,943 and took over three hours, during which attackers executed double-spending attacks against several cross-chain protocols.

The incident had little impact on the LTC price. At the time of writing, the coin is trading around $56, having fallen by 0.5% over the day.

Back in September 2025, Monero experienced its largest blockchain reorganization in 12 years. The network was rolled back by 18 blocks, rendering 117 transactions invalid.