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EUVD-2026-187657

fkie_cve-2023-42441

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). Starting in version 0.2.9 and prior to version 0.3.10, locks of the type `@nonreentrant("")` or `@nonreentrant('')` do not produce reentrancy checks at runtime. This issue is fixed in version 0.3.10. As a workaround, ensure the lock name is a non-empty string.

GHSA-3hg2-r75x-g69m — Vyper has incorrect re-entrancy lock when key is empty string

Affected: PyPI: vyper

### Impact

Locks of the type `@nonreentrant("")` or `@nonreentrant('')` do not produce reentrancy checks at runtime.

```Vyper @nonreentrant("") # unprotected @external def bar(): pass

@nonreentrant("lock") # protected @external def foo(): pass ``` ### Patches

Patched in #3605

### Workarounds

The lock name should be a non-empty string.

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

gsd-2023-42441

PYSEC-2023-305

Affected: PyPI: vyper