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.
The product compares two entities in a security-relevant context, but the comparison is incorrect, which may lead to resultant weaknesses.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Vyper | Vyperlang | * | 0.3.1 (including) |
This Pillar covers several possibilities: