In April 2026, the Litecoin network faced two interconnected incidents that caused concern in the crypto community. We have prepared a brief breakdown so you understand what happened and how it may affect your exchanges.
What happened?
1. Vulnerability in the MimbleWimble (MWEB) protocol
An attacker exploited a validation error to create a fake MWEB output worth approximately 85,000 LTC. The issue was detected and fixed by developers. The funds were returned — the attacker entered negotiations and voluntarily returned almost all the coins, keeping 850 LTC as a “bounty” for discovering the vulnerability.
2. DoS attack and 13-block reorganization
Later in April, another group of attackers carried out a Denial-of-Service (DoS) attack, overwhelming updated mining nodes. As a result, part of the network running outdated software created an alternative chain of 13 blocks (about 32 minutes) containing invalid MWEB transactions. Once the attack stopped, the network automatically reverted to the correct chain, and the problematic blocks were discarded.
How did this affect exchangers and users?
- Risks for unprepared services: Exchangers that accepted LTC with a small number of confirmations (e.g., 1–2) could temporarily credit funds that were later rolled back during the chain reorganization. This created a risk for the services, but not for end-users who were sending coins.
- What we did: We promptly increased the required number of confirmations for the Litecoin network from 6 to 20. This completely eliminates the risk of crediting rolled-back transactions. Your funds are safe.
What is the current situation?
The Litecoin network has been fully restored, all nodes are updated, and the vulnerabilities have been fixed. We will continue to monitor the situation and adjust the number of confirmations as needed.
Our advice:
When exchanging Litecoin through any service, always check how many confirmations are required. For large amounts, it is better to wait for 20–30 confirmations. At UnionXbit, we have already configured everything for your safety.
