Insufficient Control Flow Management Affecting vyper package, versions [0,]
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-VYPER-10183409
- published20 May 2025
- disclosed16 May 2025
- creditUnknown
Introduced: 16 May 2025
NewCVE-2025-47774 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
vyper is a Pythonic Smart Contract Language for the EVM.
Affected versions of this package are vulnerable to Insufficient Control Flow Management through the slice function. An attacker can bypass the evaluation of side effects in the start argument when the length argument is set to 0, and the source bytestring is a builtin msg.data or <address>.code.
PoC
counter: public(uint256)
@external
def test() -> Bytes[10]:
b: Bytes[10] = slice(msg.data, self.side_effect(), 0)
return b
def side_effect() -> uint256:
self.counter += 1
return 0