by AntoineP

This work is a collaboration between Niklas Gögge (Brink) and Antoine Poinsot (Wizardsardine).

Btcd prior to version 0.24.2 does not correctly implement the consensus rules for legacy signature verification. The incompatible behavior can be triggered by a standard transaction, making it possible for anyone to fork off vulnerable btcd nodes at virtually no cost.

...read more at delvingbitcoin.org