Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. When using the built-in `extract32(b, start)`, if the `start` index provided has for side effect to update `b`, the byte array to extract `32` bytes from, it could be that some dirty memory is read and returned by `extract32`. This vulnerability is fixed in 0.4.0.
The product reads data past the end, or before the beginning, of the intended buffer.
Link | Tags |
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https://github.com/vyperlang/vyper/security/advisories/GHSA-4hwq-4cpm-8vmx | exploit vendor advisory |
https://github.com/vyperlang/vyper/commit/3d9c537142fb99b2672f21e2057f5f202cde194f | patch |