Vyper Programming Language Vulnerability in Ethereum Virtual Machine

CVE-2025-47285

What is CVE-2025-47285?

The Vyper programming language for the Ethereum Virtual Machine contains a vulnerability in its concat() function, which may skip the evaluation of expressions with side effects when the length of an argument is zero. This issue arises from a fastpath in the implementation designed to enhance performance by bypassing the evaluation of such expressions for zero-length bytestrings. Although it is uncommon to create zero-length bytestrings with expressions that have side effects, this vulnerability could be exploited in specific scenarios. Developers are advised to avoid side effects within expressions constructing zero-length bytestrings to mitigate risks. A fix is being implemented and is expected to be included in the upcoming 0.4.2 release.

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