{"id":"CVE-2021-25948","aliases":["GHSA-x3wr-v4wx-5qpc"],"url":"https://o3.security/vulnerability/CVE-2021-25948","summary":"Prototype Pollution","details":"Prototype pollution vulnerability in 'expand-hash' versions 0.1.0 through 1.0.1 allows an attacker to cause a denial of service and may lead to remote code execution.","published":"2021-06-10T12:15:08.607Z","modified":"2026-07-08T21:27:08.883503Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"expand-hash","fixedVersion":null}],"fix":null,"references":[{"type":"EVIDENCE","url":"https://github.com/doowb/expand-hash/blob/556913f6c2f05848110b5b8261cfc78e5ce3dc77/index.js#L19"},{"type":"EVIDENCE","url":"https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25948"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25948"},{"type":"PACKAGE","url":"https://github.com/doowb/expand-hash"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T21:27:08.883503Z"}}