{"id":"GHSA-ph9x-4vc9-m39g","summary":"Vyper vulnerable to incorrect ordering of arguments for kwargs passed to internal calls","details":"### Impact\n\nInternal calls to internal functions with more than 1 default argument are compiled incorrectly. Depending on the number of arguments\nprovided in the call, the defaults are added not right-to-left, but left-to-right. If the types are incompatible,\ntypechecking is bypassed. In the `bar()` function in the following code, `self.foo(13)` is compiled to\n`self.foo(13,12)` instead of `self.foo(13,1337)`.\n\n```vyper\n@internal\ndef foo(a:uint256 = 12, b:uint256 = 1337):\n    pass\n\n@internal\ndef bar():\n    self.foo(13)\n```\n\nnote 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.\n\n### Patches\npatched in c3e68c302aa6e1429946473769dd1232145822ac\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\n### References\n_Are there any links users can visit to find out more?_\n","aliases":["CVE-2023-32059","PYSEC-2023-79"],"modified":"2026-09-10T03:50:01.672293094Z","published":"2023-05-12T20:21:00Z","database_specific":{"cwe_ids":["CWE-683"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2023-05-12T20:21:00Z","nvd_published_at":"2023-05-11T22:15:11Z"},"references":[{"type":"WEB","url":"https://github.com/vyperlang/vyper/security/advisories/GHSA-ph9x-4vc9-m39g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-32059"},{"type":"WEB","url":"https://github.com/vyperlang/vyper/commit/c3e68c302aa6e1429946473769dd1232145822ac"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-79.yaml"},{"type":"PACKAGE","url":"https://github.com/vyperlang/vyper"}],"affected":[{"package":{"name":"vyper","ecosystem":"PyPI","purl":"pkg:pypi/vyper"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.8"}]}],"versions":["0.1.0b1","0.1.0b10","0.1.0b11","0.1.0b12","0.1.0b13","0.1.0b14","0.1.0b15","0.1.0b16","0.1.0b17","0.1.0b2","0.1.0b3","0.1.0b4","0.1.0b5","0.1.0b6","0.1.0b7","0.1.0b8","0.1.0b9","0.2.1","0.2.10","0.2.11","0.2.12","0.2.13","0.2.14","0.2.15","0.2.16","0.2.2","0.2.3","0.2.4","0.2.5","0.2.6","0.2.7","0.2.8","0.2.9","0.3.0","0.3.1","0.3.2","0.3.3","0.3.4","0.3.5","0.3.6","0.3.7"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/05/GHSA-ph9x-4vc9-m39g/GHSA-ph9x-4vc9-m39g.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"}]}