Wire · operational-macro
$1.73M Notional Finance Hack: Integer Bug Exposed [2026]
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Fusion42 · 8 September 2026 · Fusion42 review
A legacy escrow smart contract on Notional Finance was exploited via an integer truncation bug that allowed an attacker to drain $1.73 million in stablecoins without stealing keys or manipulating oracles. The attacker used a crafted debt value causing Solidity's arithmetic to round the debt to zero, exposing a critical vulnerability in old contract code still holding funds.
This Wire brief sits within Fusion42's coverage of Crypto & Web3.
◆ ◆ The Wire takeaway
Legacy code still holding funds in DeFi protocols is a critical blindspot for founders building lending products. You must audit and retire old contracts immediately or risk your lending platform losing millions through overlooked math errors.
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1 source · 8 Sep 2026
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