{"id":"CVE-2021-41496","aliases":["GHSA-f7c7-j99h-c22f","PYSEC-2021-857"],"url":"https://o3.security/vulnerability/CVE-2021-41496","summary":"Buffer Copy without Checking Size of Input in NumPy","details":"Buffer overflow in the array_from_pyobj function of fortranobject.c in NumPy < 1.19, which allows attackers to conduct a Denial of Service attacks by carefully constructing an array with negative values. NOTE: The vendor does not agree this is a vulnerability; the negative dimensions can only be created by an already privileged user (or internally)","published":"2021-12-17T20:15:08.517Z","modified":"2026-07-25T18:29:52.313123525Z","cvss":{"score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"PyPI","name":"numpy","fixedVersion":"1.19"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpujul2022.html"},{"type":"FIX","url":"https://github.com/numpy/numpy/issues/19000"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-25T18:29:52.313123525Z"}}