  The LG cryptosystem is a public-key encryption scheme in the rank metric
using the recent family of $\lambdav-$Gabidulin codes and introduced in 2019 by
Lau and Tan. In this paper, we present a cryptanalysis showing that the
security of several parameters of the scheme have been overestimated. We also
show the existence of some weak keys allowing an attacker to find in polynomial
time an alternative private key.
