{"cve":"CVE-2023-42460","nvd":{"published":"2023-09-27T15:19:32.543","modified":"2026-06-17T06:23:52.767","status":"Modified","description":"Vyper is a Pythonic Smart Contract Language for the EVM. The `_abi_decode()` function does not validate input when it is nested in an expression. Uses of `_abi_decode()` can be constructed which allow for bounds checking to be bypassed resulting in incorrect results. This issue has not yet been fixed, but a fix is expected in release `0.3.10`. Users are advised to reference pull request #3626.","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-682"],"references":["https://github.com/vyperlang/vyper/pull/3626","https://github.com/vyperlang/vyper/security/advisories/GHSA-cx2q-hfxr-rj97","https://github.com/vyperlang/vyper/pull/3626","https://github.com/vyperlang/vyper/security/advisories/GHSA-cx2q-hfxr-rj97"],"products":["vyperlang:vyper"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2023-42460","score":0.00671,"percentile":0.52031,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-cx2q-hfxr-rj97","url":"https://osv.dev/vulnerability/GHSA-cx2q-hfxr-rj97","summary":"Vyper's `_abi_decode` input not validated in complex expressions","modified":"2024-11-19T17:33:26.232836Z","packages":[{"ecosystem":"PyPI","name":"vyper","purl":"pkg:pypi/vyper","ranges":[">=0.3.4 <0.3.10"],"fixed":["0.3.10"]}]},{"id":"PYSEC-2023-191","url":"https://osv.dev/vulnerability/PYSEC-2023-191","summary":"","modified":"2023-11-08T04:13:28.966407Z","packages":[{"ecosystem":"PyPI","name":"vyper","purl":"pkg:pypi/vyper","ranges":[">=0.3.4 <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."]}