Incorrect Calculation Affecting vyper package, versions [,0.2.6)
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Test your applications- Snyk IDSNYK-PYTHON-VYPER-21693751
- published24 Oct 2026
- disclosed6 Oct 2026
- creditUnknown
Introduced: 6 Oct 2026
New CVE NOT AVAILABLE CWE-682 (opens in a new tab)How to fix?
Upgrade vyper to version 0.2.6 or higher.
Overview
vyper is a Pythonic Smart Contract Language for the EVM.
Affected versions of this package are vulnerable to Incorrect Calculation via incorrect offset calculation in pack_arguments in vyper/parser/parser_utils.py when a multi-dimensional array is passed as an argument to an external call. The staticarray_offset is computed using only the top-level element count rather than the full flattened size of the type, causing arguments to be packed at wrong memory positions. An attacker can exploit this to cause a contract to pass or receive incorrect data during external calls, leading to unintended state changes.