Description
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.
References (2)
Core 2
Core References
Exploit, Vendor Advisory x_refsource_confirm
https://github.com/vyperlang/vyper/security/advisories/GHSA-ph9x-4vc9-m39g
Scores
CVSS v3
7.5
EPSS
0.0010
EPSS Percentile
26.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-683
Status
published
Products (2)
pypi/vyper
0 - 0.3.8PyPI
vyperlang/vyper
< 0.3.8
Published
May 11, 2023
Tracked Since
Feb 18, 2026