How two Ethereum ERC20 contracts got hacked (opens in new tab)

Ths situation is quite simple, today developers have no clue how data structures work in memory and this is a typical case of it. Any C developer has knowlidge about this, but if you are floating in space and can see actual memory just as a blue planet far away, this is the result. But I bet someone will say that garbage collector would solve the issue :D :D :D

Hi HN,

Yesterday trading on several tokens got halted due to discovered & exploited vulnerabilities in two smart contracts. One of them lost about 90% of its value… and another one lost 26% - $40,000,000 in market cap. in

We wanted to focus more on the technical analysis of the situation to shed some light on common vulnerabilities that still abound.

Would love your feedback, since we got some mixed reviews on whether we did a correct technical judgment of one of the contracts.