CVE-2022-24787: Incorrect Comparison

April 4, 2022 (updated August 2, 2023)

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. In version 0.3.1 and prior, bytestrings can have dirty bytes in them, resulting in the word-for-word comparisons giving incorrect results. Even without dirty nonzero bytes, two bytestrings can compare to equal if one ends with "\x00" because there is no comparison of the length. A patch is available and expected to be part of the 0.3.2 release. There are currently no known workarounds.

References

github.com/vyperlang/vyper/commit/2c73f8352635c0a433423a5b94740de1a118e508
github.com/vyperlang/vyper/security/advisories/GHSA-7vrm-3jc8-5wwm
nvd.nist.gov/vuln/detail/CVE-2022-24787

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