CVE-2025-27105

Summary

CVE-2025-27105 affects Vyper, a Pythonic Smart Contract Language for the Ethereum Virtual Machine. The vulnerability arises from Vyper's handling of AugAssign statements, which first caches the target location to prevent double evaluation. However, when the target is an access to a DynArray and the right-hand side modifies the array, the cached target is evaluated before the bounds check during the write portion of the statement. This issue has been resolved in version 0.4.1, and all users are urged to upgrade as there are currently no known workarounds for this vulnerability.

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