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EUVD-2026-211713

fkie_cve-2023-32059

Vyper is a Pythonic smart contract language for the Ethereum virtual machine. Prior to version 0.3.8, internal calls with default arguments are compiled incorrectly. Depending on the number of arguments provided in the call, the defaults are added not right-to-left, but left-to-right. If the types are incompatible, typechecking is bypassed. The ability to pass kwargs to internal functions is an undocumented feature that is not well known about. The issue is patched in version 0.3.8.

GHSA-ph9x-4vc9-m39g — Vyper vulnerable to incorrect ordering of arguments for kwargs passed to internal calls

Affected: PyPI: vyper

### Impact

Internal calls to internal functions with more than 1 default argument are compiled incorrectly. Depending on the number of arguments provided in the call, the defaults are added not right-to-left, but left-to-right. If the types are incompatible, typechecking is bypassed. In the `bar()` function in the following code, `self.foo(13)` is compiled to `self.foo(13,12)` instead of `self.foo(13,1337)`.

```vyper @internal def foo(a:uint256 = 12, b:uint256 = 1337): pass

@internal def bar(): self.foo(13) ```

note that at the time of publication, the ability to pass kwargs to internal functions is an undocumented feature that does not seem to be widely used.

### Patches patched in c3e68c302aa6e1429946473769dd1232145822ac

### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_

### References _Are there any links users can visit to find out more?_

gsd-2023-32059

PYSEC-2023-79

Affected: PyPI: vyper