Accusations have been going around since the early 2000s but I don't think any governments released the hard evidence to the public.
https://en.wikipedia.org/wiki/Criticism_of_Huawei#Espionage_...
https://en.wikipedia.org/wiki/Criticism_of_Huawei#Espionage_...
Guess we'll need to wait 50 years to get an idea.