{"cve":"CVE-2023-30837","nvd":{"published":"2023-05-08T17:15:12.007","modified":"2026-06-17T05:55:44.453","status":"Modified","description":"Vyper is a pythonic smart contract language for the EVM. The storage allocator does not guard against allocation overflows in versions prior to 0.3.8. An attacker can overwrite the owner variable. This issue was fixed in version 0.3.8.","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:H/A:N","score":7.5},"cwes":["CWE-789"],"references":["https://github.com/vyperlang/vyper/commit/0bb7203b584e771b23536ba065a6efda457161bb","https://github.com/vyperlang/vyper/security/advisories/GHSA-mgv8-gggw-mrg6","https://github.com/vyperlang/vyper/commit/0bb7203b584e771b23536ba065a6efda457161bb","https://github.com/vyperlang/vyper/security/advisories/GHSA-mgv8-gggw-mrg6"],"products":["vyperlang:vyper"],"source":"nvd","synced_at":"2026-10-19T21:38:18.424950729+00:00"},"epss":{"cve":"CVE-2023-30837","score":0.00697,"percentile":0.53092,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-mgv8-gggw-mrg6","url":"https://osv.dev/vulnerability/GHSA-mgv8-gggw-mrg6","summary":"vyper vulnerable to storage allocator overflow","modified":"2026-09-10T03:50:01.648781390Z","packages":[{"ecosystem":"PyPI","name":"vyper","purl":"pkg:pypi/vyper","ranges":["<0.3.8"],"fixed":["0.3.8"]}]},{"id":"PYSEC-2023-76","url":"https://osv.dev/vulnerability/PYSEC-2023-76","summary":"","modified":"2023-11-08T04:12:26.960645Z","packages":[{"ecosystem":"PyPI","name":"vyper","purl":"pkg:pypi/vyper","ranges":["<0.3.8"],"fixed":["0.3.8"]}]}],"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."]}