Vyper vulnerable to integer overflow in loop

CVE-2023-32058

What is CVE-2023-32058?

An overflow vulnerability in Vyper, a smart contract language for the Ethereum virtual machine, allows for potential exploits in loop constructs. The issue arises when assigning the iterator variable in a loop defined as for i in range(a, a + N), leading to possible overflow due to missing checks. In contrast, the compiler effectively raises a TypeMismatch error for other loop types, such as for i in range(start, stop), thus preventing overflow in those cases. This vulnerability has been addressed in version 0.3.8, and all users are encouraged to upgrade to mitigate risks.

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