{"id":"GHSA-3hg2-r75x-g69m","summary":"Vyper has incorrect re-entrancy lock when key is empty string","details":"### Impact\n\nLocks of the type `@nonreentrant(\"\")` or `@nonreentrant('')` do not produce reentrancy checks at runtime.\n\n```Vyper\n@nonreentrant(\"\") # unprotected\n@external\ndef bar():\n    pass\n\n@nonreentrant(\"lock\") # protected\n@external\ndef foo():\n    pass\n```\n### Patches\n\nPatched in #3605\n\n### Workarounds\n\nThe lock name should be a non-empty string.\n\n### References\n_Are there any links users can visit to find out more?_\n","aliases":["CVE-2023-42441","PYSEC-2023-305"],"modified":"2026-09-10T03:50:03.191650148Z","published":"2023-09-18T19:20:55Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2023-09-18T19:20:55Z","nvd_published_at":"2023-09-18T21:16:09Z","cwe_ids":["CWE-667","CWE-833"]},"references":[{"type":"WEB","url":"https://github.com/vyperlang/vyper/security/advisories/GHSA-3hg2-r75x-g69m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-42441"},{"type":"WEB","url":"https://github.com/vyperlang/vyper/pull/3605"},{"type":"WEB","url":"https://github.com/vyperlang/vyper/commit/0b740280c1e3c5528a20d47b29831948ddcc6d83"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-305.yaml"},{"type":"PACKAGE","url":"https://github.com/vyperlang/vyper"}],"affected":[{"package":{"name":"vyper","ecosystem":"PyPI","purl":"pkg:pypi/vyper"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.2.9"},{"fixed":"0.3.10"}]}],"versions":["0.2.10","0.2.11","0.2.12","0.2.13","0.2.14","0.2.15","0.2.16","0.2.9","0.3.0","0.3.1","0.3.10rc1","0.3.10rc2","0.3.10rc3","0.3.10rc4","0.3.10rc5","0.3.2","0.3.3","0.3.4","0.3.5","0.3.6","0.3.7","0.3.8","0.3.9"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/09/GHSA-3hg2-r75x-g69m/GHSA-3hg2-r75x-g69m.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:L/A:N"}]}