CVE-2023-32059
highpriority · track · 30EPSS 0.007 · 54 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (3)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- GHSA-ph9x-4vc9-m39gVyper vulnerable to incorrect ordering of arguments for kwargs passed to internal calls2023-05-12ghsa · osvUS
### Impact Internal calls to internal functions with more than 1 default argument 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. In the `bar()` function in the following code, `self.foo(13)` is compiled to `self.foo(13,12)` instead of `self.foo(13,1337)`. ```vyper @internal def foo(a:uint256 = 12, b:uint256 = 1337): pass @internal def bar(): self.foo(13) ``` note that at the time of publication, the ability to pass kwargs to internal functions is an undocumented feature that does not seem to be widely used. ### Patches patched in c3e68c302aa6e1429946473769dd1232145822ac ### 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?_
- PYSEC-2023-792023-05-11vendor · osvUS
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.
also known as (6)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (7)
External citations — patches, advisories, analysis.
- https://cxsecurity.com/cveshow/CVE-2023-32059/cnnvd
- https://github.com/vyperlang/vyper/commit/c3e68c302aa6e1429946473769dd1232145822accnnvd
- https://github.com/vyperlang/vyper/security/advisories/GHSA-ph9x-4vc9-m39gcnnvd
- https://github.com/vyperlang/vyper/commit/c3e68c302aa6e1429946473769dd1232145822acenisa_euvd
- https://github.com/vyperlang/vyper/security/advisories/GHSA-ph9x-4vc9-m39genisa_euvd
- https://github.com/vyperlang/vyper/commit/c3e68c302aa6e1429946473769dd1232145822acPatchnvd
- https://github.com/vyperlang/vyper/security/advisories/GHSA-ph9x-4vc9-m39gExploitVendor Advisorynvd
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