Simultaneously, the contract (used by dozens of DeFi protocols) suffered from a re‑entrancy bug in its updateAnswer function. When an attacker called updateAnswer , the contract emitted an event that was picked up by a price‑watcher off‑chain bot. That bot, in turn, called back into updateAnswer to confirm the new price, creating a recursive loop that allowed the attacker to inflate the LINK balance of the aggregator contract.
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