There is none in recent years. Huawei even offered to open its complete source code to the US government for inspection but got turned down.
There is evidence that the US spy agency hacked in Huawei HQ for years and still the US cannot produce evidence of Huawei wrongdoing. But then again it's possible the US don't want to disclose it's intel source.
There is evidence that the US spy agency hacked in Huawei HQ for years and still the US cannot produce evidence of Huawei wrongdoing. But then again it's possible the US don't want to disclose it's intel source.