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EUVD-2026-212520

fkie_cve-2023-30837

Vyper is a pythonic smart contract language for the EVM. The storage allocator does not guard against allocation overflows in versions prior to 0.3.8. An attacker can overwrite the owner variable. This issue was fixed in version 0.3.8.

GHSA-mgv8-gggw-mrg6 — vyper vulnerable to storage allocator overflow

Affected: PyPI: vyper

### Impact The storage allocator does not guard against allocation overflows. This can result in vulnerabilities like the following: ```vyper owner: public(address) take_up_some_space: public(uint256[10]) buffer: public(uint256[max_value(uint256)])

@external def initialize(): self.owner = msg.sender

@external def foo(idx: uint256, data: uint256): self.buffer[idx] = data ``` Per @toonvanhove, "An attacker can overwrite the owner variable by calling this contract with calldata: `0x04bc52f8 fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff5 ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff` (spaces inserted for readability) `0x04bc52f8` is the selector for `foo(uint256, uint256)`, and the last argument `fff...fff` is the new value for the owner variable."

### Patches patched in 0bb7203b584e771b23536ba065a6efda457161bb

### 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-2023-30837

PYSEC-2023-76

Affected: PyPI: vyper