Staking is often marketed as 'passive income,' but it carries risks distinct from simply holding an asset. The most talked-about is slashing: a protocol-level penalty that burns a portion of a validator's stake if they go offline for too long (liveness faults) or sign conflicting blocks (equivocation, usually the result of misconfiguration or an attack). If you delegated to that validator, you typically bear a proportional share of the penalty.
Lockup and unbonding risk is more mundane but more common: many chains hold your tokens for days or weeks after you request to unstake, during which you cannot sell even if the market moves sharply against you. Always check a network's specific unbonding period before committing capital.
Liquid staking and restaking introduce smart-contract risk: a bug in the staking protocol's contracts, its oracle, or its withdrawal logic could result in loss of funds independent of the underlying chain's health. Restaking protocols in particular stack additional slashing conditions on top of base staking risk.
Finally, there's counterparty and custody risk when staking through a centralized exchange: you're trusting that platform's solvency and security practices, not just the blockchain's. Diversifying across validators and, where relevant, across providers is a standard way to reduce concentration risk.