Vulnerability Is Found in Constantinople Hours After ETH Devs Call It ‘Least Eventful’ Hard Fork

Ethereum’s (ETH) Constantinople hard fork faces a delay over a newly discovered security vulnerability allowing a reentrancy attack. The critical issue was detected by smart contract audit firm ChainSecurity and reported in a blog post Jan. 15.

According to the company’s report, the Constantinople upgrade introduces cheaper gas cost (transaction fees) for some operations on the network. As an unexpected side effect, this allegedly enables reentrancy attacks via the use of certain commands in ETH smart contracts.

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