{"cve":"CVE-2025-27105","nvd":{"published":"2025-02-21T22:15:13.910","modified":"2026-06-17T09:03:02.543","status":"Analyzed","description":"vyper is a Pythonic Smart Contract Language for the EVM. Vyper handles AugAssign statements by first caching the target location to avoid double evaluation. However, in the case when target is an access to a DynArray and the rhs modifies the array, the cached target will evaluate first, and the bounds check will not be re-evaluated during the write portion of the statement. This issue has been addressed in version 0.4.1 and all users are advised to upgrade. There are no known workarounds for this vulnerability.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","score":2.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","score":9.1},"cwes":["CWE-787"],"references":["https://github.com/vyperlang/vyper/security/advisories/GHSA-4w26-8p97-f4jp"],"products":["vyperlang:vyper"],"source":"nvd","synced_at":"2026-10-19T21:59:48.811064707+00:00"},"epss":{"cve":"CVE-2025-27105","score":0.0057,"percentile":0.47227,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-4w26-8p97-f4jp","url":"https://osv.dev/vulnerability/GHSA-4w26-8p97-f4jp","summary":"AugAssign evaluation order causing OOB write within the object in Vyper","modified":"2025-04-09T20:36:40.722370Z","packages":[{"ecosystem":"PyPI","name":"vyper","purl":"pkg:pypi/vyper","ranges":["<0.4.1"],"fixed":["0.4.1"]}]},{"id":"PYSEC-2025-31","url":"https://osv.dev/vulnerability/PYSEC-2025-31","summary":"","modified":"2025-04-09T17:59:24.390760Z","packages":[{"ecosystem":"PyPI","name":"vyper","purl":"pkg:pypi/vyper","ranges":["<0.4.1"],"fixed":["0.4.1"]}]}],"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."]}