{"cve":"CVE-2023-42441","nvd":{"published":"2023-09-18T21:16:09.750","modified":"2026-06-17T06:23:50.140","status":"Modified","description":"Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). Starting in version 0.2.9 and prior to version 0.3.10, locks of the type `@nonreentrant(\"\")` or `@nonreentrant('')` do not produce reentrancy checks at runtime. This issue is fixed in version 0.3.10. As a workaround, ensure the lock name is a non-empty string.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-667","CWE-833"],"references":["https://github.com/vyperlang/vyper/commit/0b740280c1e3c5528a20d47b29831948ddcc6d83","https://github.com/vyperlang/vyper/pull/3605","https://github.com/vyperlang/vyper/security/advisories/GHSA-3hg2-r75x-g69m","https://github.com/vyperlang/vyper/commit/0b740280c1e3c5528a20d47b29831948ddcc6d83","https://github.com/vyperlang/vyper/pull/3605"],"products":["vyperlang:vyper"],"source":"nvd","synced_at":"2026-10-19T21:39:24.235896374+00:00"},"epss":{"cve":"CVE-2023-42441","score":0.00514,"percentile":0.43797,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-3hg2-r75x-g69m","url":"https://osv.dev/vulnerability/GHSA-3hg2-r75x-g69m","summary":"Vyper has incorrect re-entrancy lock when key is empty string","modified":"2026-09-10T03:50:03.191650148Z","packages":[{"ecosystem":"PyPI","name":"vyper","purl":"pkg:pypi/vyper","ranges":[">=0.2.9 <0.3.10"],"fixed":["0.3.10"]}]},{"id":"PYSEC-2023-305","url":"https://osv.dev/vulnerability/PYSEC-2023-305","summary":"","modified":"2024-11-21T14:57:14.248607Z","packages":[{"ecosystem":"PyPI","name":"vyper","purl":"pkg:pypi/vyper","ranges":[">=0.2.9 <0.3.10"],"fixed":["0.3.10"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}