CVE-2022-29255

HIGH

vyper < 0.3.4 - Always-Incorrect Control Flow Implementation in External Contract Calls

Title source: llm
STIX 2.1

Description

Vyper is a Pythonic Smart Contract Language for the ethereum virtual machine. In versions prior to 0.3.4 when a calling an external contract with no return value, the contract address (including side effects) could be evaluated twice. This may result in incorrect outcomes for contracts. This issue has been addressed in v0.3.4.

References (2)

Core 2
Core References
Exploit, Mitigation, Third Party Advisory x_refsource_confirm
https://github.com/vyperlang/vyper/security/advisories/GHSA-4v9q-cgpw-cf38

Scores

CVSS v3 8.2
EPSS 0.0118
EPSS Percentile 63.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-670
Status published
Products (2)
pypi/vyper 0 - 0.3.4PyPI
vyperlang/vyper < 0.3.4
Published Jun 09, 2022
Tracked Since Feb 18, 2026