Flash loan

A flash loan is an uncollateralised loan that must be borrowed and repaid within a single transaction. It removes capital as a barrier to manipulation, letting an attacker move a market with money they do not have.

manipulation techniques · updated 2026-09-08

Where does flash loan come up?

This term is used in the following manipulation techniques, each explained in full on its own page.

• Oracle manipulation — Oracle manipulation moves the price source a smart contract reads, usually a shallow liquidity pool, so that a protocol values collateral wrongly and can be drained within a single transaction.

Enforcement actions involving these techniques

See also

• Price oracle — A price oracle supplies external price data to a smart contract. If a protocol reads its oracle from a shallow pool, an attacker c…
• Liquidity pool — A liquidity pool is a smart contract holding two or more assets against which traders swap, with prices set by a formula rather th…

Terms that refer here

Price oracle

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