Litecoin fixes bug after 13-block chain reorg

Litecoin confirmed a zero-day bug triggered a denial-of-service attack on April 25, 2026, causing a 13-block chain reorganisation that reversed invalid transactions.

The issue stemmed from non-updated mining nodes processing invalid MimbleWimble Extension Block (MWEB) transactions, allowing attackers to attempt fraudulent transfers to third-party platforms.

The Litecoin team said all valid transactions remained safe and the exploit has been fully patched, with the network now operating normally.

The reorg, initially suspected to be a 51% attack, instead reflected the network discarding an invalid chain produced during the exploit window.

NEAR Intents had estimated around $600,000 in exposure, though actual losses may be lower after the invalid transactions were removed from the main chain.

The incident also forced cross-chain protocols to pause activity, with reassessments expected following confirmation that the exploit did not result in lasting settlement losses.

“This isn’t an isolated incident… including recently against Monero and Grin,”

Said Zooko Wilcox, highlighting broader risks tied to outdated nodes in proof-of-work networks.

At the time of reporting, Litecoin price was $55.84.