How Does RBF Relate to the Concept of “Transaction Malleability” in Cryptocurrency?

Transaction malleability is the ability for a third party to alter a transaction's ID (TXID) before confirmation without changing its inputs or outputs. RBF is a feature that allows the sender to intentionally replace their own unconfirmed transaction with a new, higher-fee version, effectively creating a double-spend that nodes accept.

While both involve replacing a transaction, RBF is a controlled protocol function by the sender, whereas malleability was a vulnerability largely fixed by SegWit.