Are Proof of Stake Networks Also Vulnerable to Majority Attacks?

Yes, Proof of Stake (PoS) networks are vulnerable to majority attacks, but they manifest differently than in PoW. In PoS, an attacker would need to acquire a majority of the network's staked cryptocurrency, which could be 51% or in some cases as low as 34%, to control validation.

However, acquiring such a large stake would be incredibly expensive, and the attacker's own holdings would be at risk of being "slashed" (destroyed) as a penalty for malicious behavior. This economic disincentive is the primary defense against such attacks.